English Reference
verb · noun

boost

v. · n.
US /ˈbust/ UK /bˈuːst/ boost UK spelling boosted, boosts

  1. 01 B1 Intermediate

    v.to help something grow, improve, or become more successful.

    v.to augment, encourage, or promote the growth or progress of something. Transitive; requires a direct object such as 'confidence', 'sales', or 'morale'.

    Simple

    The warm weather helped to boost ice cream sales this month.

    In context

    The central bank's decision to lower interest rates was intended to boost consumer spending and stimulate the sluggish economy.

  2. 02 B2 Upper Intermediate

    v.to push someone up from below so they can reach something high.

    v.to provide a physical lift or upward push to someone, typically to assist them in climbing.

    Simple

    He boosted his daughter up so she could see over the tall fence.

    In context

    The hikers had to boost each other over the rocky ledge to reach the summit before the sun went down.

  3. 03 C1 Advanced SlangInformal

    v.to steal something, especially from a shop.

    v.to shoplift or steal merchandise. Primarily used in informal or criminal contexts.

    Simple

    He was caught trying to boost a pair of expensive headphones from the electronics store.

    In context

    The security footage clearly showed the suspect attempting to boost several high-end watches from the display case.

    stealshopliftpilfer
  4. 04 B1 Intermediate

    n.something that helps you feel better or makes a situation more successful.

    n.an act or event that brings about an increase in power, value, or emotional state.

    Simple

    Winning the first game gave the whole team a huge confidence boost.

    In context

    The unexpected endorsement from the industry leader provided a significant boost to the startup's reputation among investors.

  5. 05 C1 Advanced Technical Engineering

    n.the extra power in a car engine from a turbocharger.

    n.the increase in manifold pressure above atmospheric pressure in an internal combustion engine, typically via a supercharger or turbocharger.

    Simple

    The driver felt the boost kick in as the car accelerated down the straight track.

    In context

    The mechanic adjusted the wastegate to ensure the engine maintained a consistent level of boost during high-speed performance.

Usage boost to the economy

He says it has given him a "self-confidence boost".

BBC News· 15 Aug 2026

I felt like I needed to play a bit more, to play every game, that was really important for me.” That Brighton had been aware of her for some time was a boost too.

The Guardian· 17 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Common
Updated