cave in
noun
°The act of something collapsing or caving in.
°The location where something has caved in.
"We couldn't get past the cave in blocking the tunnel."
verb
°To collapse inward or downward.
°To relent; to acquiesce; to comply; to grant approval; to lose willpower.
synonyms: breakage, collapse, rockfall, blockage more» , acquiescence, consent, sellout, break, crush, give way, stave, stave in, assent, give in, give up, relinquish, yield