プログレッシブ和英中辞典(第4版)の解説
いっしょ（う）けんめい【一生懸命・一所懸命】
一生懸命勉強した
I studied 「very hard [as hard as I could].
一生懸命に逃げた
I ran for my [dear] life.
一生懸命に仕事をしている
He is working for all he's worth.／He is putting his all into his work.
一生懸命やります［やってみます］
I will do [try] my best.
とびらを一生懸命押した
I pushed on the door with all my might.
彼女は姑を喜ばせようと一生懸命だった
She did her best to please her mother-in-law.