A push from behind, as to one who is endeavoring to climb.

Something that helps, or adds power or effectiveness; assistance.

(physics) A coordinate transformation that changes velocity.

(automotive engineering) A positive intake manifold pressure in cars with turbochargers or superchargers.

(transitive) To lift or push from behind (one who is endeavoring to climb); to push up.

(transitive, by extension) To help or encourage (something) to increase or improve; to assist in overcoming obstacles.

(slang, transitive) To steal.

(Canada, transitive) To jump-start a vehicle by using cables to connect the battery in a running vehicle to the battery in a vehicle that won't start.

(transitive, medicine) To give a booster shot to.

(transitive, engineering) To amplify; to signal boost.