verb (used with object)

  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. to steal, especially to shoplift: Two typewriters were boosted from the office last night.

verb (used without object)

  1. Slang. to engage in stealing, especially 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.


  1. encouragement, improvement, or helpa boost to morale
  2. an upward thrust or pushhe gave him a boost over the wall
  3. an increase or risea boost in salary
  4. a publicity campaign; promotion
  5. the amount by which the induction pressure of a supercharged internal-combustion engine exceeds that of the ambient pressure

verb (tr)

  1. to encourage, assist, or improveto boost morale
  2. to lift by giving a push from below or behind
  3. to increase or raiseto boost the voltage in an electrical circuit
  4. to cause to rise; increaseto 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

1815, literal and figurative, American English, of unknown origin. Related: Boosted; boosting. As a noun by 1825.

  1. A linear map from one reference frame to another in which each coordinate is increased or decreased by an independent constant or linear function. A boost corresponds to a shift of the entire coordinate system without any rotation of its axes.

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