Meaning of きせんをせいする in Japanese
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きせん
を
せいする
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Definition of きせんをせいする
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(exp, vs-s) to beat someone to the punch; to have the drop; to forestall
連中がこのことに気づかぬうち機先を制したほうがいいでしょう。
We'd probably be best off beating them to the punch before they notice that fact.