other N2 common casualpolitewritten

〜を〜に任せる — to leave ~ to ~

〜を〜に任せる・をにまかせる

Meaning

to leave A to B / entrust A to B / put A in B's hands — hand a task, decision, or thing over to someone (or something) to handle

細こまかいことは部下ぶかに任まかせる。

I leave the details to my subordinates.

Attaches to	Form	Example
A (the thing) を + B (the person/agent) に + 任まかせる	AをBに任まかせる	仕事しごとを彼かれに任まかせる / 判断はんだんを現場げんばに任まかせる

夕食ゆうしょくの準備じゅんびを妻つまに任まかせた。

I left preparing dinner to my wife.

あとは運うんを天てんに任まかせるしかない。

All that's left is to leave it up to fate.

The thing handed over takes を; the person it's entrusted to takes に. Reversing them changes who does what: AをBに任まかせる means B handles A.

Common set phrases: 運うんを天てんに任まかせる ('leave it to fate'), 力ちから任まかせ ('relying on brute force'). The intransitive feel of 'just let it happen' appears in 成なり行ゆきに任まかせる ('let things take their course').

Jengo shows 〜を〜に任せる the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Sources Compiled from published Japanese grammar references.