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一所懸命

with all one's might, as hard as one can; hard, diligently

noun Rare #39,993
with all one's might, as hard as one can; hard, diligently Often written 一生懸命 in modern Japanese.
JA: 一所懸命勉強した。
EN: I studied as hard as I could.

一所懸命になって彼はその木に登った。

He climbed the tree with all his might.

もっと一所懸命勉強するって約束したよね。

You promised you'd study harder, remember?

私だって一所懸命なんだ

I'm trying my best too.

— 自転車泥棒 (1948)