noun, noun or participle which takes 'suru', intransitive verb
Childish or playful misbehavior; often used when scolding children or describing cute naughtiness. Can be used as a noun or with する to mean 'to act up'.
またおいたをして、お母さんに怒られた。
I got scolded by Mom for being naughty again.
猫がおいたして、花瓶を倒した。
The cat acted up and knocked over the vase.
noun, noun or participle which takes 'suru', intransitive verb
affair; extramarital fling
Colloquial, often used euphemistically for a casual extramarital affair or sexual mischief. Typically used by adults in informal contexts.
彼は妻に隠れておいたをしていたらしい。
Apparently he was having an affair behind his wife's back.