at first sight

Từ điển Oxford Advanced Learner 8th

at first ˈsight idiom
1. when you first begin to consider sth
• At first sight, it may look like a generous offer, but always read the small print.
2. when you see sb/sth for the first time
• It was love at first sight (= we fell in love the first time we saw each other).
• We fell in love with the house at first sight.
Main entry: ↑sight_idiom