Definition of in adverb from the Oxford Advanced Learner's Dictionary

      

    in

     adverb
    adverb
    BrE BrE//ɪn//
     
    ; NAmE NAmE//ɪn//
     
    For the special uses of in in phrasal verbs, look at the entries for the verbs. For example fill in (for somebody) is in the phrasal verb section at fill. Tennis, Cricket
     
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  1. 1  contained within an object, an area or a substance We were locked in. I can't drink coffee with milk in.
  2. 2  into an object, an area or a substance She opened the door and went in. The kids were playing by the river and one of them fell in.
  3. 3  (of people) at home or at a place of work Nobody was in when we called. opposite out
  4. 4  (of trains, buses, etc.) at the place where people can get on or off, for example the station The bus is due in (= it should arrive) at six.
  5. 5  (of letters, etc.) received Applications must be in by April 30.
  6. 6  (of the tide) at or towards its highest point on land Is the tide coming in or going out?
  7. 7elected Several new councillors got in at the last election.
  8. 8(in cricket, baseball, etc.) if a team or team member is in, they are batting See related entries: Cricket
  9. 9(in tennis, etc.) if the ball is in, it has landed inside the line Her serve was just in. See related entries: Tennis
  10. Word Origin Old English in (preposition), inn, inne (adverb), of Germanic origin; related to Dutch and German in (preposition), German ein (adverb), from an Indo-European root shared by Latin in and Greek en.Idioms to be present when something happens They were in at the start. (informal) to be going to experience something soon, especially something unpleasant He's in for a shock! I'm afraid we're in for a storm. (informal) to be/become involved in something; to share or know about something I'd like to be in on the plan. Is she in on the secret?
    be (well) in with somebody
     
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    (informal) to be (very) friendly with somebody, and likely to get an advantage from the friendship
    in and out (of something)
     
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    going regularly to a place He was in and out of jail for most of his life.
See the Oxford Advanced American Dictionary entry: in