Meaning of せんをこす in Japanese
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Definition of せんをこす
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(exp, v5s) to take the initiative; to forestall; to beat to the punch
私は今日自分の申込書を上司に提出するつもりだったが、彼に先を越されてしまった。
I was going to hand in my application form to the boss today, but he beat me to the punch.