to increase or improve something and make it more successful:
The new resort area has boosted tourism.
boost somebody's confidence/morale/ego
The win boosted the team's confidence.
2 also boost up
to help someone reach a higher place by lifting or pushing them:
He boosted her up.
if a rocket or motor boosts a spacecraft, it makes it go up into space or go in a particular direction
4 American English informal
to steal something