CAVE

I. noun see: cyme Date: 13th century a natural underground chamber or series of chambers open to the surface, a usually underground chamber for storage , II. verb (~d; caving) Date: 15th century transitive verb to form a ~ in or under ; hollow , undermine , intransitive verb to explore ~s especially as a sport or hobby, ~r noun III. verb (~d; caving) Etymology: probably alteration of calve Date: 1513 intransitive verb to fall in or down especially from being undermined, to cease to resist ; submit , transitive verb to cause to fall or collapse