cave in

cave in

1. verb To collapse into a hollow area below, as of a physical structure or formation. We were able to get the kids out of the house before the roof caved in.
2. verb To collapse, faint, or die, as from over-exertion. I hardly remember the end of the marathon because I caved in as soon as I crossed the finish line.
3. verb To submit, concede, or yield (to someone or something); to surrender or acknowledge defeat. Under the threat of a strike, the management caved in and agreed to reinstate annual pay increases for all employees.
4. noun A collapse into a hollow area below, as of a physical structure or formation. When used as a noun, the phrase is usually hyphenated. The fear of every miner is a cave-in.
See also: cave
Farlex Dictionary of Idioms.

cave in (to someone or something)

Fig. to give in to someone or something. Finally, the manager caved in to the customer's demands. I refuse to cave in under pressure from my opponent.
See also: cave

cave in

[for a roof or ceiling] to collapse. The roof of the mine caved in when no one was there. The tunnel caved in on the train.
See also: cave
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

cave in

1. Fall in, collapse, as in The earthquake made the walls cave in. [Early 1700s]
2. Give in, admit defeat, as in The prosecutor's questions soon made the witness cave in. [Early 1800s]
3. Collapse, faint, or die from exhaustion, as in After a twenty-mile hike I caved in. [Mid-1800s]
See also: cave
The American Heritage® Dictionary of Idioms by Christine Ammer.

cave in

v.
To give way; collapse: The sides of the snow fort caved in. The mine shaft caved in on a group of miners, but fortunately they were rescued.
See also: cave
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • go on
  • go on (doing something)
  • Go on!
  • going on
  • gone on
  • bag it
  • bag someone
  • bagged
  • bagging
  • going to
References in periodicals archive
There is a well-known anecdote that insists: "Growth is optional; change is mandatory." Cave In is in-the-flesh proof that though the maturation process can be difficult, the results are often immensely gratifying.