do one's job 本来の役目を果たす

do one's job, do the job　は辞書がなくてもよくわかるイディオム。2:58 it did its job. 航空機の強度が増して、この飛行機は乗客全員の人命を救った。飛行機の役目を立派に果たした。

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3:47 if I get you to say that, if my property is part of your daily routine in some form of fashion, we did our job. 私がつくった店に行こうとか、人が毎日その店の世話になるとか、皆が言ってくれるようなら、、、私の仕事は一応合格だ。

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6:46 it definitely does the job. 立派に寝室の役割を果たしてくれるよ。

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3:35 futon, not very thick but it does the job. この敷布団はそんなにぶ厚くないけれども、ちゃんと寝れる。

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練習問題解答
a-6326 do the job
a-7413 doing his job