expression, godan verb (-tsu)
gain the upper hand; prevail; dominate
Used when someone or something gains a superior position in a competition, negotiation, or comparison. Often implies an active effort to get ahead.
交渉では、相手より優位に立つことが大切だ。
In negotiations, it's important to gain the upper hand over the other party.
彼はライバルに優位に立つために、新しい戦略を考えた。
He devised a new strategy to get ahead of his rival.