カクッと

カクッと, カクっと, かくっとkakutto

adverb

  1. collapsing
  2. losing strength
  3. slumping
  4. losing balance

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences