機き先せんを制せいする

expression, suru verb (special)

beat to the punch; get the drop on; forestall

Idiomatic phrase meaning to act before an opponent or competitor, seizing the initiative. Often used in strategic, business, or competitive contexts.

• ライバル会社がいしゃに機き先せんを制せいされて、新しん製せい品ひんの発はつ売ばいが遅おくれた。

  Our rival company beat us to the punch, and our new product launch was delayed.

• 交こう渉しょうでは、相あい手てに機き先せんを制せいされないように準じゅん備びが大たい切せつだ。

  In negotiations, preparation is crucial so that the other party doesn't get the drop on you.