gakkuri
Suddenly slumping with disappointment or loss of strength — head and shoulders dropping when crushed by bad news.
💡Seeing a failing grade — 'I went gakkuri when I saw the results.'
試験に落ちてがっくりした。
I slumped gakkuri when I failed the exam.
He slumped ___ when he heard he didn't get the job.
試験に落ちて○○した。