(someone's) heart misses/skips a beat

if someone's heart misses a beat, they suddenly feel so excited or frightened that their heart beats faster.

Ben walked into the room and her heart skipped a beat.

• keep a foot in both camps
• keep after
• keep after someone
• keep after something
• keep a grip on
• keep a grip on yourself
• keep a lid on
• keep a lid on something
• keep a low profile
• keep an ear out for
• keep an ear out for someone
• keep an ear out for something
• keep an ear to the ground
• keep an eye on
• keep an eye on someone
• keep an eye on something
• keep an eye out
• keep an eye out for
• keep an eye out for someone
• keep an eye out for something
• keep an open mind
• keep a straight face
• keep at
• keep at arm's length
• keep at bay