發高燒

Simplified: 发高烧

fāgāoshāo ㄈㄚ ㄍㄠ ㄕㄠ

    • to act rashly out of overheated enthusiasm or emotion
    • to be feverishly irrational

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
to run a high fever
Meaning
To be overheated and irrational, acting rashly out of enthusiasm or emotion. Mildly critical.

Sources