1. A rapid, strong, or irregular heartbeat that is noticeable to the person experiencing it
She experienced heart palpitations after drinking too much coffee.
Ela experimentou palpitações cardíacas após beber muito café.
2. Rapid throbbing or trembling movements, especially involuntary ones
The palpitations in his hands revealed his nervousness.
As palpitações em suas mãos revelaram seu nervosismo.