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Origin of cave-in
British Dictionary definitions for cave-in
verb (intr, adverb)
Idioms and Phrases with cave-in
Fall in, collapse, as in The earthquake made the walls cave in. [Early 1700s]
Give in, admit defeat, as in The prosecutor's questions soon made the witness cave in. [Early 1800s]
Collapse, faint, or die from exhaustion, as in After a twenty-mile hike I caved in. [Mid-1800s]