Enter a clue or pattern or both:
The Clue
___ in (collapsing) (6 letter answer)
The Answer
CAVING
Tags
Notes
The answer CAVING is so rare that it appears less than once every 2500 puzzles.
Definition
CAVE as a verb:
1. (cave, undermine) = hollow out as if making a cave or opening; "The river was caving the banks"
2. (cave, spelunk) = explore natural caves