your heart skips a beat
US /jʊər hɑːrt skɪps ə biːt/
UK /jʊər hɑːrt skɪps ə biːt/

1.
心跳漏了一拍, 心头一震
to feel a sudden shock, surprise, or excitement
:
•
When I saw him after all these years, my heart skipped a beat.
这么多年后再次见到他,我的心跳漏了一拍。
•
The sudden loud noise made my heart skip a beat.
突然的巨响让我的心跳漏了一拍。