Longman Dictionary of Contemporary English homepage

boost

1 verb
     
boost1 [transitive]
1 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.
3 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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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