verb trans
to attach or secure (somebody or something), esp by pinning, tying, or nailing them or it
to fix or direct (something) steadily
He fastened his eyes on the awful sight
(+ on) to attach or impose (something) on somebody
They fastened the blame on me
to become fixed
fasten on/upon/onto
to focus attention on (something)
to take a firm grip or hold on (something)
[Old English fæstnian to secure, confirm]