応ずる
おうずる · ouzuru · JLPT N2 · verb-ichidan
to respond
🙋 Sounds like oh, sure! — what you say when you comply with a request
応 means respond or answer, as in 反応 (reaction) and 応答 (reply). ずる is an older form of する (to do), so 応ずる is literally to do a response. Saying oh, sure to a request is exactly that.