your heart skips a beat
US /jʊər hɑːrt skɪps ə biːt/
UK /jʊər hɑːrt skɪps ə biːt/
1.
to feel a sudden shock, surprise, or excitement
:
•
When I saw him after all these years, my heart skipped a beat.
•
The sudden loud noise made my heart skip a beat.