a mug's game
US /ə mʌɡz ɡeɪm/
UK /ə mʌɡz ɡeɪm/

1.
어리석은 짓, 헛수고
an activity or situation that is likely to be unsuccessful or to cause problems for the person involved
:
•
Trying to get rich quick is often a mug's game.
빨리 부자가 되려는 것은 종종 어리석은 짓이다.
•
He realized that betting on horse races was a mug's game.
그는 경마에 돈을 거는 것이 어리석은 짓이라는 것을 깨달았다.