Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Origin: Probably from calve 'to cave in' (18-19 centuries), perhaps from Flemish inkalven; influenced by CAVE1

cave

2 verb
     
cave2

cave in

phrasal verb
1 if the top or sides of something cave in, they fall down or inwards
cave in on
The roof of the tunnel caved in on them.
2 to finally stop opposing something, especially because someone has persuaded or threatened you
cave in to
The chairman is expected to cave in to pressure from shareholders.

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