Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “fire sth up”

fire sth up

phrasal verb with fire     /faɪər/ US  /faɪr/ verb
to start a machine or computer program : The old plane was firing up its engines . This system uses voice activation to fire up its web browser .
(Definition of fire sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of fire sth up

Word of the Day


the art and knowledge involved in preparing and eating good food

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More