monkey business in Japanese
monkey business in Japanese
悪戯
Activity that is mischievous, stupid, or time-wasting. [from mid 19th c.]
いんちき
Activity that is morally questionable or even mildly illegal.
インチキ
Activity that is morally questionable or even mildly illegal.
裏工作
Activity that is morally questionable or even mildly illegal.