1. (verb) throw-in
(rugby) an act or instance of throwing a ball in to put it into play
2. (verb) throw in
add as an extra or as a gratuity
3. (verb) drop out, give up, fall by the wayside, drop by the wayside, throw in, throw in the towel, quit, chuck up the sponge
give up in the face of defeat of lacking hope; admit defeat
"In the second round, the challenger gave up"
4. (verb) interject, come in, interpose, put in, throw in, inject
to insert between other elements
"She interjected clever remarks"
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Definitions of throw-in 
