|Origin:||fæstnian; related to FAST2|
clothes/bag etcalso fasten up
to join together the two sides of a coat, shirt, bag etc so that it is closed [= do up; ≠ unfasten]:
'I'm going now,' she said, fastening her coat.
Fasten your seat belt.
to become joined together with buttons, hooks etc [= do up]:
I was so fat that my skirt wouldn't fasten.
to firmly close a window, gate etc so that it will not open, or to become firmly closed [≠ unfasten]:
window/gate etc[intransitive and transitive]
Make sure all the windows are securely fastened before you leave.
to attach something firmly to another object or surface
attach something to something[transitive]
fasten something with something
Fasten the edges of the cloth together with pins.
fasten something to something
They fastened the rope to a tree.
to hold something firmly with your hands, legs, arms, or teeth
hold something tightly[intransitive and transitive]
fasten something around/round something
She fastened her arms around his neck.
A strong hand fastened round her wrist.
Their long claws allow them to fasten onto the rocks and hold firm.
to look at someone or something for a long time:
He rose, his eyes still fastened on the piece of paper.
to think a lot about one particular thing or person:
He was working quietly, all his attention fastened on the task.
fasten on/upon somethingphrasal verb
My mother fastened on the word "unsafe".
fasten onto somebody/somethingphrasal verb
to give particular attention to something because you think it is important or interesting
to follow someone and stay with them, especially when they do not want you to [= latch onto somebody]:
The dog seemed lost and fastened onto us.