Her heart tripped with the harsh tone of his voice.

Slowly she opened one of the smaller, thicker books, and her heart tripped over a beat.

He smiled and Julia's heart tripped at the sheer force of his beauty.

A black Mercedes turned the corner two blocks in front of me, and my heart tripped.

My heart tripped and then began to pound as we stopped in front of the house.

Her heart seemed to stop, then tripped and shot straight up into her throat.

Her heart tripped at the sound of his voice.

Her heart tripped over itself at the thought that he might be there, waiting for her.

He seemed so serious her heart tripped over itself.

Her heart tripped and took a beat to get back into.