Answer: squinch

AnswerCrossword Clue
SQUINCHAppropriate rhyme for flinch
squinchto contort (the features) or squint
squinchsmall arch, corbeling, or the like, built across the interior angle between two walls, as in a square tower for supporting the side of a superimposed octagonal spire
squinchto squeeze together or crouch down, as to fit into a smaller space
squinchto squint (to look with the eyes partly closed)
squinchto squeeze together or contract