noun which may take the genitive case particle 'no', noun
very easy; a piece of cake; child's play
Idiomatic expression meaning something is extremely easy, often used in casual conversation. Literally 'before breakfast', implying a task so simple it can be done before the morning meal.
こんな問題、朝飯前だよ。
This kind of problem is a piece of cake.
彼にとっては朝飯前の仕事だった。
For him, it was a cinch of a job.
before breakfast
Original literal meaning, now rare. Refers to the time before eating breakfast. Mostly encountered in historical or explanatory contexts.
「朝飯前」はもともと、朝食の前の時間を指す言葉だった。
Originally, 'asameshimae' referred to the time before breakfast.