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1. verb To submit or give something to someone. In this usage, a noun or pronoun can be used between "hand" and "in." I have to go hand in my term paper now.
2. noun A contributory role in something. It was pretty exciting to have a hand in launching the new business. We're going to find everyone who had a hand in this robbery and arrest them.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*a hand in somethingand *a part in something
Fig. a part in establishing or running something. (*Typically: get ~ have ~ give someone ∼.) I would like to have a hand in the planning process. I will not let Jane have a part in this project.
hand something in
(to someone) Go to pass something in (to someone).
hand something in
to submit something by hand. Did you hand your application form in? I forgot to hand in my test paper.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To deliver or submit something to someone: I handed in my homework. The committee finally handed the proposal in to the mayor.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
hand in/and glove
On intimate terms or in close association: "The folklore of American academia says that publishing and teaching go hand in glove" (Edward B. Fiske).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.