Definition of day noun from the Oxford Advanced American Dictionary

      

    day

     noun
    noun
    NAmE//deɪ//
     
     
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  1. 1 [countable] a period of 24 hours I saw Tom three days ago. “What day is it today?” “Monday.” We're going away in a few days. They left the day before yesterday (= two days ago). We're meeting the day after tomorrow (= in two days). New Year's Day Take the medicine three times a day. We can't go there today. You can go another day. see also field day, off day, red-letter day
  2. 2[uncountable] the time between when it becomes light in the morning and when it becomes dark in the evening The sun was shining all day. I could sit and watch the river all day long. He works at night and sleeps during the day. Nocturnal animals sleep by day and hunt by night.
  3. 3 [countable, usually singular] the hours of the day when you are awake, working, etc. a seven-hour working day It's been a long day (= I've been very busy). Did you have a good day? She didn't do a full day's work. I took a half day off yesterday. Have a nice day! see also workday
  4. 4 [countable, usually plural] a particular period of time or history in George Washington's day the early days of computers Most women stayed at home in those days. (informal) in the old days (= in the past) see also glory days, heyday, nowadays, the present day There are many other compounds ending in day. You will find them at their place in the alphabet.
  5. Idioms
    all in a day's work
     
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    part of your normal working life and not unusual
    any day (now)(informal)
     
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    very soon The letter should arrive any day now.
    back in the day
     
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    in the past My dad's always talking about how great everything was back in the day.
    back in the days
     
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    at a particular time in the past I was a fan back in the days when the band wasn't yet famous.
    carry/win the day(formal)
     
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    to be successful against someone or something Despite strong opposition, the ruling party carried the day.
    day after day
     
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    each day repeatedly (used especially when something is boring or annoying) She hates doing the same work day after day.
    all the time; a little at a time and gradually Day by day his condition improved.
    day in, day out,day in and day out
     
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    every day for a long period of time Living on junk food day in, day out is not good for you.
    a day of reckoning
     
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    the time when someone will have to deal with the result of something that they have done wrong, or be punished for something bad that they have done
    somebody's/something's days are numbered
     
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    a person or thing will not continue to live, exist, or be successful for much longer His days as leader of the party are numbered. Whatever the protests, the school's days are numbered and it will be closed down.
    from day one(informal)
     
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    from the beginning It's never worked from day one. This game makes reading and spelling fun from day one.
      from day to day
       
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    1. 1 with no thoughts or plans for the future They live from day to day, taking care of their sick daughter.
    2. 2if a situation changes from day to day, it changes often A baby's need for food can vary from day to day.
    from one day to the next
     
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    if a situation changes from one day to the next, it is uncertain and not likely to stay the same each day I never know what to expect from one day to the next.
    have had your day
     
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    to no longer be successful, powerful, etc. She's had her day as a supermodel.
    have seen/known better days(humorous)
     
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    to be in poor condition Our car has seen better days!
    if he's, she's, etc. a day(informal)
     
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    (used when talking about someone's age) at least He must be 70 if he's a day!
      in somebody's day
       
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    1. 1during the part of someone's life when they were most successful, famous, etc. She was a great dancer in her day.
    2. 2 when someone was young In my day, there were plenty of jobs when you left school. In Grandpa's day, owning a television was very unusual.
    in this day and age
     
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    now, in the modern world
    it's not somebody's day(informal)
     
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    used when several unfortunate or unpleasant things happen on the same day My car broke down and then I locked myself out—it's just not my day!
    it's not every day (that..)
     
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    used when something unusual happens, especially something good or enjoyable It's not every day that I have such an expensive lunch!
    make somebody's day
     
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    to make someone feel very happy on a particular day The phone call from Mike really made my day.
    make a day of it(informal)
     
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    to make a particular enjoyable activity last for a whole day instead of only part of it We took a picnic lunch to the river and made a day of it.
    not have all day
     
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    to not have much time Come on! We don't have all day!
    of somebody's day
     
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    during a particular period of time when someone lived the best player of his day Bessie Smith was the Madonna of her day.
    that is served on a particular day in a restaurant soup of the day at some time in the future, or on a particular day in the past One day, I want to leave the city and move to the country. One day, he walked out of the house with a small bag and never came back.
    one of these days
     
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    before a long time has passed One of these days you'll come back and ask me to forgive you.
    one of those days(informal)
     
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    a day when there are a lot of mistakes and a lot of things go wrong It's been one of those days!
    take it/things one day at a time(informal)
     
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    to not think about what will happen in the future I don't know if he'll get better. We're just taking it one day at a time.
    that'll be the day(informal)(ironic)
     
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    used when you are saying that something is very unlikely to happen Paul? Apologize? That'll be the day!
    these days(informal)
     
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    used to talk about the present, especially when you are comparing it with the past These days kids grow up so quickly.
    those were the days(informal)
     
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    used to suggest that a time in the past was happier or better than now
    exactly It's been three years to the day since we met.
    to this day
     
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    even now, when a lot of time has passed To this day, I still don't understand why he did it.
See the Oxford Advanced Learner's Dictionary entry: day