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pack it in

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Stop working or abandon an activity, as in Let's pack it in for the day. This usage alludes to packing one's things before departing, and during World War I became military slang for being killed. It also is used as an imperative ordering someone to stop, as in Pack it in! I've heard enough out of you. In Britain it is also put as pack it up. [Colloquial; early 1900s]

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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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