1. （心脏）悸动，急速而不规则地跳动
If someone's heart palpitates, it beats very fast in an irregular way, because they are frightened or anxious.

2. 颤动；抖动
If something palpitates, it shakes or seems to shake.

1. beat rapidly

e.g. His heart palpitated

Synonym: flutter

2. shake with fast, tremulous movements

e.g. His nostrils palpitated

Synonym: quiverquake

3. cause to throb or beat rapidly

e.g. Her violent feelings palpitated the young woman's heart