noun
leaving it to one's man; entrusting to one's husband/boyfriend
Often used when a woman leaves a decision or task to her male partner, sometimes with a nuance of relying on him or letting him take charge.
家計の管理は男任せにしている。
She leaves the household finances up to her husband.
旅行の計画を男任せにしたら、行き先が決まらなかった。
When she left the trip planning to her boyfriend, they couldn't decide on a destination.