身が入る

みがはいる

to give one's everything; to make one's best effort; to be enthused; to put your back into it

expression verb

Example sentences

あんなに騒（さわ）がしくては何事（なにごと）にも身（み）が入（はい）らない。

I can't apply my mind to anything with all that noise!

あいつら仕事（しごと）にまるで身（み）が入（はい）ってないようだけど、まだまだ学生（がくせい）気分（きぶん）が抜（ぬ）けてないんだろうな。

I don't think they've fully adapted to the working world yet. They still seem like students.