WordReference Random House Learner's Dictionary of American English © 2014
boost /bust/USA pronunciation v. [+ object] to lift by pushing from below:I boosted the youngster into the top of her bunk bed. to help (someone) by speaking well of:boosted his friend as likely to win the election. to increase; raise:to boost prices.
n. [countable] an upward shove or raise;
lift:gave him a little boost into his highchair.
an increase; rise: a boost in prices. an act or remark that helps one's morale, efforts, etc.:After praise from the coach, the whole team felt a boost in morale.

Collins Concise English Dictionary © HarperCollins Publishers::

boost /buːst/ n
  1. encouragement, improvement, or help: a boost to morale
  2. an upward thrust or push
  3. an increase or rise
  4. the amount by which the induction pressure of a supercharged internal-combustion engine exceeds that of the ambient pressure
vb (transitive)
  1. to encourage, assist, or improve: to boost morale
  2. to lift by giving a push from below or behind
  3. to increase or raise: to boost the voltage in an electrical circuit
  4. to cause to rise; increase: to boost sales
  5. to advertise on a big scale
  6. to increase the induction pressure of (an internal-combustion engine) above that of the ambient pressure; supercharge
Etymology: 19th Century: of unknown origin

'boost' also found in these entries:

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