Definitions for "jackhammer"
a hammer having a strong steel cutting blade, driven by compressed air in multiple rapid strokes, and used for cutting through pavement, concrete, or other hard substances.
a good example of a pneumatic solenoid in action
A pneumatic concrete breaker.
Jackhammer is the name of a comic book supervillain owned by Marvel Comics.
Keywords:  bodyon, dancer, elbow, laying, ground
a move performed on the ground having the dancer balancing on one hand and laying his bodyon the elbow of the same arm
Keywords:  don't, know, tool
a tool, but I don't know how to use it