Shut up! have done! I'll cave in his head (break it).
His fortune has caved in (has failed). The bank has caved in
(come to a smash). The affair caved in (fell through). Common
In the lead diggings, after a shaft has been sunk, the earth round
the sides falls or caves in, unless properly boarded; and if the
mine does not answer, no care is taken to prevent a caving in.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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