monkey business

IPA(Pronunciation)

Noun

idiomatic informal uncountable

Activity that is mischievous, stupid, or time-wasting. / Activity that is morally questionable or even mildly illegal.

Japanese Meaning

いたずら的で、愚か、あるいは時間を浪費する行動 / 道徳的に疑わしい、または軽微な違法行為に近い行動

The manager warned the team to stop the monkey business and focus on completing the project.

マネージャーはチームに、いたずらや無駄な行為をやめてプロジェクトの完了に集中するよう注意した。

Sense（1）

Activity that is mischievous, stupid, or time-wasting.

Stop all this monkey business and do your homework!

Sense（2）

Activity that is morally questionable or even mildly illegal.