jack hammer

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Definitions from WordNet

Noun jack hammer has 1 sense

air hammer, jackhammer, pneumatic hammer - a hammer driven by compressed air
--₁ is a kind of hammer, power hammer

Definitions from the Web

Jack Hammer

Definition:

A jack hammer is a powerful hand-held tool used for breaking hard materials such as concrete and rocks by delivering a high-impact force. It typically consists of a hammer-like mechanism that is pneumatically driven or electrically powered.

Senses:

Sense 1:

Noun - a power tool used for breaking hard materials

Example Sentence: The construction crew used a jack hammer to break up the concrete pavement.

Sense 2:

Verb - to use a jack hammer

Example Sentence: The workers jack hammered their way through the solid rock to create a tunnel.