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English definition of “back”

back

adverb     /bæk/
RETURNING A1 where someone or something was before: I'll be back in Sydney on the 20th. When do you go back to college ? I put it back in the cupboard .Returning to a place
BEHIND B1 in a direction behind you: Anna stepped back. Flint leaned back in his chair .Backwards, sideways and back and forth
REPLY A2 as a reply or reaction to something: UK to ring back/ US to call back I signalled to her and she waved back.Answering and responding
STATE B1 to the state something or someone was in before: Hopefully things will get back to normal again now. I'm sure we can put it back together again (= repair it). Try to go back to sleep .In the past
EARLIER B2 at or to an earlier time : We first met back in 1973. Looking back, I think we did the right thing.In the past
AWAY FROM B2 in a direction away from something: He pulled back the curtain . The house was a short distance back from the road .Backwards, sideways and back and forth
back and forth (also backwards and forwards) in one direction , then the opposite way, then in the original direction again many times : He has to travel back and forth between London and Paris every week .Backwards, sideways and back and forth
(Definition of back adverb from the Cambridge Learner's Dictionary © Cambridge University Press)

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