fasten up
A2 neutral separable both
In simple words
To close your clothes properly — buttons, zips, buckles, and so on.
Literal meaning: To fasten (close with a device) going upward — the 'up' suggests completion.
Meanings
1 A2 neutral
To close clothing using buttons, a zip, buckle, or other fastener.
"Fasten up your coat — it's freezing outside."
Grammar: separable
2 A2 neutral
To close or secure a bag, case, or other container.
"She fastened up her suitcase and headed for the door."
Grammar: separable
Usage notes
Common in everyday speech. Often used when telling children to close their clothing, or in safety contexts (seatbelts, helmets). Can also refer to bags or cases.
Commonly used with
coat jacket seatbelt bag zip buttons
Forms
Base
fasten up
I/you/we/they
3rd person
fastens up
he/she/it
Past simple
fastened up
yesterday
Past participle
fastened up
have + pp
-ing form
fastening up
continuous
Understand "fasten up" better
Try:
Real video examples
Video examples are being collected. Check back soon.
Synonyms
Want to master this phrasal verb?
Practice "fasten up" on Looplines