I. noun
a usually natural underground chamber
the limestone caves of Kentucky
Synonyms: cavern, grotto, subterrane, subterranean
II. verb
1.
Synonyms: give 12, bend, break, collapse, crumple, fold up, go, yield
2.
Synonyms: yield 2, bow, buckle (under), capitulate, defer, knuckle, knuckle under, submit, succumb