n. 25B6; noun
a boost to one's morale : UPLIFT, lift, spur, encouragement, help, inspiration, stimulus, fillip.
a boost in sales : INCREASE, expansion, upturn, upsurge, upswing, rise, escalation, improvement, advance, growth, boom; informal hike.
decrease.
25B6; verb
he phones her to boost her morale : IMPROVE, raise, uplift, increase, enhance, encourage, heighten, help, promote, foster, stimulate, invigorate, revitalize; informal buck up.
they used advertising to boost sales : INCREASE, raise, escalate, improve, strengthen, inflate, push up, promote, advance, foster, stimulate; facilitate, help, assist, aid; informal hike, bump up.
decrease.