go to pieces
US /ɡoʊ tə ˈpiːsɪz/
UK /ɡoʊ tə ˈpiːsɪz/

1.
崩潰, 垮掉
to become so upset or nervous that you cannot function normally
:
•
After the accident, she completely went to pieces.
事故發生後,她徹底崩潰了。
•
He tends to go to pieces under pressure.
他一有壓力就容易崩潰。