take French leave
US /teɪk frɛnʧ liːv/
UK /teɪk frɛnʧ liːv/

1.
不辭而別, 擅離職守
to leave without permission or without telling anyone
:
•
He decided to take French leave from the meeting, much to his boss's annoyance.
他決定不辭而別地離開會議,這讓他的老闆非常惱火。
•
The soldier was punished for taking French leave from his post.
這名士兵因擅離職守而受到懲罰。