(one's) heart skips a beat
One feels a flutter in one's chest or stomach from fear, nervousness, or excitement. My heart skipped a beat when I saw that the doctor was calling with the results from the test. I swear, my heart skipped a beat the first time I saw my wife. My heart skips a beat every time I'm called into my boss's office.
heart skips a beat
(One) experiences nervousness or excitement. I swear, my heart skipped a beat the first time I saw my wife. My heart skips a beat every time I'm called into my boss's office.