meet your match
US /miːt jʊər mætʃ/
UK /miːt jʊər mætʃ/

1.
対等な相手と出会う, 敵わない相手と出会う
to encounter someone who is equal or superior to you in skill, strength, or ability, often leading to a challenge or defeat
:
•
The undefeated boxer finally met his match in the championship fight.
無敗のボクサーはついにチャンピオンシップの試合で対等な相手と出会った。
•
She thought she was the best debater, but she definitely met her match in the new student.
彼女は最高の討論者だと思っていたが、新しい学生には間違いなく対等な相手と出会った。