Learner's definition of POUNCE
to suddenly jump toward and take hold of someone or something
— usually + on
— often used figuratively
A salesperson pounced on me [=quickly approached me] as soon as I walked into the store.
When a few documents showed that the mayor had avoided paying his taxes, the press pounced on [=attacked] him.
She lost control of the ball, and the other team pounced on the opportunity to score.
He pounced on the job offer.
to act or move quickly and suddenly