失态 (shī tài): Lose one's composure (Verb) — Meaning & Stroke Order

He got drunk and acted a bit inappropriately.

Even when faced with provocation, he has never lost his composure in public.

Upon learning he was not selected, he suppressed his disappointment and tried hard not to lose his composure.

Faced with sudden criticism, he momentarily lost his composure and retorted loudly.

While arguing with a friend, he realized he was about to lose his composure and proactively paused the conversation.