Definitions

1. noun

A person or machine that pumps something, especially a fire engine.

“The fire department used a pumper to put out the massive blaze.”

2. verb

To pump something, especially air or water.

“She pumped her fist in the air to celebrate her victory.”

3. verb

To make someone or something feel excited or enthusiastic.

“The politician’s speech pumped up the crowd with its inspiring message.”