WordReference Random House Learner's Dictionary of American English © 2015
boost /bust/USA pronunciation   v. [+ object]
  1. to lift by pushing from below:I boosted the youngster into the top of her bunk bed.
  2. to help (someone) by speaking well of:boosted his friend as likely to win the election.
  3. to increase; raise:to boost prices.

n. [countable]
  1. an upward shove or raise;
    lift:gave him a little boost into his highchair.
  2. an increase; rise: a boost in prices.
  3. an act or remark that helps one's morale, efforts, etc.:After praise from the coach, the whole team felt a boost in morale.

WordReference Random House Unabridged Dictionary of American English © 2015
boost  (bo̅o̅st), 
  1. to lift or raise by pushing from behind or below.
  2. to advance or aid by speaking well of;
    promote:She always boosts her hometown.
  3. to increase; raise:to boost prices;
    to boost the horsepower of the car by 20 percent.
  4. Slang Terms[Slang.]to steal, esp. to shoplift:Two typewriters were boosted from the office last night.

  1. Slang Terms[Slang.]to engage in stealing, esp. shoplifting.

  1. an upward shove or raise; lift.
  2. an increase;
    rise:There's been a tremendous boost in food prices.
  3. an act, remark, or the like, that helps one's progress, morale, efforts, etc.:His pep talk was the boost our team needed.
  • perh. Scots dialect, dialectal boose (variant of pouss push) + (hoi)st 1805–15, American.
7 . hike, growth, upsurge, upswing, uptick.

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

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