Legs pump like pistons.

Meaning: His legs are moving up and down quickly like the pistons in an engine.

Choice of Words: "Pump" means to move something up and down or in and out. "Legs" are the limbs used for walking or running. "Pistons" are parts of an engine that move up and down to create power.

Alternative Expressions

Related Expressions

• He ran quickly, his legs pumping like pistons.
• Pistons pumped with relentless power.
• Gills pump water, extracting oxygen.
• Hearts pump blood.
• Pump air
• His legs felt like lead.
• Her arms and legs flowed like a river in the wind.
• Kangaroos have strong legs.
• The giraffe's long legs helped it run faster than most predators.
• They made snow angels by lying down and flapping their arms and legs.