Definition of in noun from the Oxford Advanced American Dictionary

 

in

 noun
noun
NAmE//ɪn//
 
 
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Idioms
have an in with somebody
 
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to have influence with someone
the ins and outs (of something)
 
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all the details, especially the complicated or difficult ones the ins and outs of the problem He quickly learned the ins and outs of the job.
an in to something
 
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= a way into something
See the Oxford Advanced Learner's Dictionary entry: in