noun
plural caves
[count] :a large hole that was formed by natural processes in the side of a cliff or hill or under the ground
verb
caves; caved; caving
cave in
[phrasal verb]
to fall down or inward
b cave (something) in or cave in (something) :to cause (something) to fall down or inward
informal :to stop trying to resist or oppose something :to give in or submit to pressure