1. a machine or device that drives piles (long posts or beams) into the ground by repeated blows or pressure
Usage: construction and engineering term
2. a person or thing that drives with great force or impact
Usage: informal

Examples

• The construction crew used a piledriver to set the foundation posts deep into the earth.
• The new piledriver on the job site can drive piles faster than the old hydraulic model.
• That boxer is a real piledriver—his punches have tremendous force.
• The team's piledriver of a running back broke through the defense for a touchdown.
• Engineers selected a steam-powered piledriver for the bridge project.