someone who is on the rebound is upset or confused because their romantic relationship has just ended:
He first met me when I was on the rebound, after splitting up with Mark.
a ball that is on the rebound has just hit something and is moving back through the air:
I caught the ball on the rebound.
something that is on the rebound is starting to increase or improve again:
The market seems to be on the rebound.
2 [countable] technicalDSB
an act of catching a basketball after a player has tried but failed to get a point