noun
a collapse or fall in of a structure or natural formation, typically caused by external pressure or force
verb
to collapse or fall in, especially due to external pressure or force
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The structural engineer warned that heavy rainfall could cause a cave in on the construction site.
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I heard that the old mine shaft might cave in if they don't reinforce it soon.
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Dude, if you keep eating junk food, your stomach is gonna cave in!
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Under pressure from the media, the politician finally caved in and admitted to the scandal.