Definition of here adverb from the Oxford Advanced American Dictionary

      

    here

     adverb
    adverb
    NAmE//hɪr//
     
     
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  1. 1 used after a verb or preposition to mean “in, at, or to this position or place” I live here. Put the box here. Let's get out of here. Come over here.
  2. 2now; at this point The countdown to Christmas starts here. Here the speaker paused to have a drink.
  3. 3used when you are giving or showing something to someone Here's the money I promised you. Here's a dish that is simple and quick to make. Here is your opportunity. Here comes the bus. I can't find my keys. Oh,here they are. Here we are (= we've arrived).
  4. 4here to do something used to show your role in a situation I'm here to help you.
  5. 5(used after a noun, for emphasis) My friend here saw it happen.
  6. Idioms
    here and there
     
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    in various places Papers were scattered here and there on the floor.
    here goes(informal)
     
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    used when you are telling people that you are just going to do something exciting, dangerous, etc. “Here goes,” said Grace and took a deep breath.
    here's to somebody/something
     
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    used to wish someone health or success, as you lift a glass and drink a toast Here's to your future happiness!
    here, there, and everywhere
     
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    in many different places; all around
    here we go(informal)
     
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    said when something is starting to happen “Here we go,” thought Fred, “she's sure to say something.”
    here we go again(informal)
     
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    said when something is starting to happen again, especially something bad
    here you are(informal)
     
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    used when you are giving something to someone Here you are. This is what you were asking for.
    here you go(informal)
     
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     used when you are giving something to someone Here you go. Four copies, right?
    neither here nor there
     
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    not important synonym irrelevant What might have happened is neither here nor there.
    out of here(informal)
     
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    going or leaving As soon as I get my money I'm out of here!
See the Oxford Advanced Learner's Dictionary entry: here