boost

American  

[boost] / bust /

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. to administer a booster shot to.

   Have you and your family been boosted yet?

5. Slang. to steal, especially to shoplift.

   Two computers were boosted from the office last night.

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verb (used without object)

1. Slang. to engage in stealing, especially shoplifting.

noun

1. an upward shove or raise; lift.

2. an increase; rise.

   There's been a tremendous boost in food prices.

   Synonyms:

   uptick, upswing, upsurge, growth, hike

3. an act, remark, or the like, that helps one's progress, morale, efforts, etc..

   His pep talk was the boost our team needed.

boost British  

/ buːst /

noun

1. encouragement, improvement, or help

   a boost to morale

2. an upward thrust or push

   he gave him a boost over the wall

3. an increase or rise

   a 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

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verb

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

boost Scientific  

/ bo̅o̅st /

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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Etymology

Origin of boost

An Americanism dating back to 1815–25; perhaps Scots dialect boose (variant of pouss push ) + (hoi)st

Explanation

Think of the word boost as meaning "help up." Maybe you need a boost getting over a fence (hmm — are you sneaking in or sneaking out?), or maybe you are feeling low and need to boost your spirits — chocolate, anyone? Sometimes words appear that really don't have any clear origins. Boost is one of those words, but it's a fun word, and it's thought that maybe it has some connection to boose, a Scots dialect word that carries the idea of a push. A slang meaning of the word is to sneakily steal, like shoplifting. You gave your cousin a boost into the window, not knowing he was planning on boosting some sneakers.

Example Sentences

Some investors may have wanted to see a boost to the full-year forecast in light of various beats registered in the latest quarter.

From MarketWatch • Apr. 29, 2026

New vehicle launches should in the longer term boost the adjusted operating margin in its core business back to 8%-10%, from 5% in 2025, the company said earlier this year.

From The Wall Street Journal • Apr. 29, 2026

Airbnb is casting the proposal as an easy way to boost city revenue.

From Los Angeles Times • Apr. 29, 2026

Earlier work from Engelward's lab has shown that inflammation can also boost cell division, suggesting that conditions that stress the liver could increase vulnerability to NDMA.

From Science Daily • Apr. 29, 2026

Along with improvements in his physical and mental strength, the training helped boost Roosevelt’s self-confidence.

From "Death on the River of Doubt" by Samantha Seiple

Related Words

• addition
• advance
• breakthrough
• expansion
• hike
• improvement
• increment
• jump
• lift
• rise