Longman Dictionary of Contemporary English - boost

~1 v 1 to increase something such as production, sales etc because they are not as high as you want them to be  (The advertising campaign is intended to boost sales.) 2 boost sb's confidence/morale/ego to make someone feel more confident and less worried  (He regularly phones to boost her morale.) 3 to advertise something by discussing or praising it  (a special promotion to boost their new product) 4 also boost up to help someone reach a higher place by lifting them  (Can you boost me up onto the horse?) ~2 n 1 something that helps someone be more successful and confident, or that helps something increase or improve  (Last night's victory was a tremendous boost to the team.) give (sb/sth) a boost  (Being chosen to attend the conference gave Matthew a real boost. | ego/morale boost (=an increase in confidence))  (He wanted a dizzy blonde as a boost to his ego.) 2 an increase in the amount of power available to a rocket1 (1), piece of electrical equipment etc 3 give sb a boost (up) to lift someone so that they can reach a higher place  (If I give you a boost up, could you reach the window?)