transitive verb
1. : to add as a gratuity or supplement
compromised in the end by throwing in a cheap clock — Arthur Morrison
2. : to introduce or interject in the course of something : contribute
not a word wasted, not a sentiment capriciously thrown in — Matthew Arnold
3. : distribute 3b(1)
4.
a. : to cause (as gears) to mesh
b. : engage
throw in the clutch
intransitive verb
1. : to enter into association or partnership : join
agrees to throw in with a crooked ex-cop — Newsweek
2. : drop 2b(6)
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- throw in one's hand
- throw in one's lot with
- throw in the sponge