› an act or event that increases or improves something: Typically sales jump in the autumn, when they get a boost from the back-to-school and holiday shopping seasons. The campaign for pension reform received a boost on Friday. Shares on Wall Street were given a boost by a rally in the US Treasury bond market. a big/major/huge/significant boost
› an increase: a boost in sth Motorists who operate diesel-powered vehicles would face a 1.5-cent-a-gallon boost in fuel taxes. The income boost for the two million lowest paid will not take effect until October.