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I came across this sentence in a manga and its meaning is rather obscure to
me:

> 成すべきことを成す。

I tried to translate it as:

> To do what has to be done.

Moreover, it would be great to know if this sentence is a common idiom or just
a normal sentence that anybody could spontaneously come up with.
CC BY-SA 3.0
2016-11-20T01:33:19.160
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2016-11-20T08:23:41.270
2016-11-20T08:23:41.270
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question
translation expressions idioms
Meaning of the sentence : 「成すべきことを成す」
Your translation is correct.

The sentence is not an idiom because the meaning is exactly what it says. An
idiom is when the meaning of the expression is different from the meaning of
the individual words.

It seems to be quite common. I searched the net and Google gives me 6,220
results.
CC BY-SA 3.0
2016-11-20T02:06:56.220
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2016-11-20T02:06:56.220
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answer