verb
fasten
FASS-uhn/ˈfæsn/
To attach or hold something firmly in place.
She fastens the buckle on her backpack.

Etymology
Fæstnian meant “to make firm or secure,” preserving the older meaning of fast still heard in “hold fast.” To fasten something is to put it into that firmly fixed state.
In context
the Scarecrow and the Woodman now began to fasten the mice to the truck using the strings they had brought one end of a string was tied around the neck of each Mouse
More examples
- Please fasten your seat belt.
- She fastened the brooch to her jacket.
- The lid fastens with two metal clips.
Forms
fasten · fastens · fastened · fastening
fastener noun — a device that holds things together