kuta-tto
The body or an object suddenly losing all stiffness and going limp. Like a flower wilting or collapsing into a chair.
💡Finishing a marathon — 'She crossed the finish line and went kuta-tto on the ground.'
疲れてソファにくたっと倒れ込んだ。
Exhausted, I collapsed kuta-tto onto the sofa.
After the hike, I ___ collapsed onto the bed.
ハイキングの後、ベッドに○○と倒れ込んだ。