also: カクン · カクンッ
adverb, adverb taking the 'to' particle
with a collapse; with a slump
Mimetic adverb describing a sudden loss of strength, causing something to collapse, slump, or droop. Often used with と and verbs like なる or する.
Exhausted, I slumped to my knees.
The doll's head drooped forward with a slump.