An increase or improvement in something. The new marketing strategy gave a significant boost to the company's sales.
A source of help or encouragement leading to an increase or improvement. The coach's pep talk was a real boost for the team's morale.
A push from below or behind to help someone or something rise or move upward. He gave her a boost over the fence.
A sudden increase in power, voltage, or signal amplitude. The amplifier gives the signal an extra boost.
Slang: an act of stealing or shoplifting. Security caught him during a boost at the electronics store.