Definition of hand in phrasal verb from the Oxford Advanced American Dictionary

 

hand in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

hand somethingin (to somebody)

 
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to give something to a person in authority, especially a piece of work or something that is lost You must all hand in your projects by the end of next week. I handed the watch in to the police. to hand in your notice/resignation (= formally tell your employer that you want to stop working for them)
See the Oxford Advanced Learner's Dictionary entry: hand in