(~s, palpitating, ~d)
1.
If someone’s heart ~s, it beats very fast in an irregular way, because they are frightened or anxious.
He felt suddenly faint, and his heart began to ~.
VERB: V
2.
If something ~s, it shakes or seems to shake. (LITERARY)
She lay on the bed, her eyes closed and her bosom palpitating.
VERB: V-ing, also V