Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “fasten”


verb [I/T]  /ˈfæs·ən/ us  
to make or become firmly attached or closed: [I] This skirt fastens at the back. [T] Fasten your seatbelt.
(Definition of fasten from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of fasten?
Browse related topics

You are looking at an entry to do with Fastening and tying, but you might be interested in these topics from the Cutting and joining topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “fasten” in other dictionaries

Word of the Day


a type of dark brown beer with a bitter taste

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