expression, godan verb (-ru)
gain an advantage; become advantageous; turn the tables
Describes a situation or position becoming favorable for someone, often after a change. The phrase is a set expression combining 有利 (advantageous) with になる (to become).
新しい証拠が見つかって、裁判は彼に有利になった。
New evidence was found, and the trial turned in his favor.
このルール変
This rule change will likely benefit large corporations.