boost / boōst/ • v. [tr.] help or encourage (something) to increase or improve: a range of measures to boost tourism. ∎  push from below; assist: people they were trying to boost over a wall. ∎  amplify (an electrical signal). ∎ Informal steal, esp. by shoplifting or pickpocketing.• n. a source of help or encouragement leading to increase or improvement: the cut in interest rates will give a further boost to the economy. ∎  an increase or improvement: a boost in exports. ∎ a push from below.

boost (orig. U.S.) hoist up, give a lift to, increase. XIX. of unkn. orig.