From Longman Dictionary of Contemporary Englishcave in phrasal verb1 FALLif the top or sides of something cave in, they fall down or inwards on The roof of the tunnel caved in on them.2 ACCEPTto finally stop opposing something, especially because someone has persuaded or threatened you to The chairman is expected to cave in to pressure from shareholders. → cave→ See Verb table
Examples from the Corpus
cave in• Strike leaders are privately saying they would like an end to the dispute, but don't want to be seen to be caving in.• Wooden beams support the roof, preventing it from caving in on the miners.• The roof has caved in, so the whole building has been declared unsafe.• It's unlikely that the government will cave in to the rebels' demands.cave on• After a few hours, the cage starts to cave in on the divers.cave to• We were afraid that Fifi was caving in to family pressure and regressing into some nice third-world girl.• They accused the government, which is led by Hindu nationalists, of caving in to foreign pressure.cave-inˈcave-in noun [countable] 1 when the roof of something such as a mine falls in2 when someone stops opposing somethingExamples from the Corpus
cave-in• One day there was a cave-in.• There was no mention of flooding and cave-ins and being trapped underground.• The Hunt report was thus seen on the Shankill as a craven cave-in to Fenian rioters.• Seems there was some others saw him after I did, monkeying about by that cave-in again.• I rather think he must just have picked it up when Mr Hambro chased him away from the cave-in. 