Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “buckle up”

buckle up

phrasal verb with buckle    /ˈbʌk·əl/ verb [I/T]
to fasten your seat belt (= belt attached to a seat ): We believe in safe driving , buckling up, and observing the speed limit .
(Definition of buckle up from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of buckle up

Word of the Day


a situation in which two people are friends

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