fasten
verb
1 he fastened the door behind him:
bolt, lock, secure, make secure, make fast, chain, seal.
▷antonyms unfasten, unlock.
2 they fastened splints to his leg:
attach, fix, affix, clip, pin, tack;
stick, bond.
▷antonyms unfasten, remove.
3 the belt was fastened with an enormous silver buckle:
buckle, join, do up, connect, couple, close, unite, link;
lace (up), knot;
button (up);
zip (up).
▷antonyms unfasten, open.
4 he fastened his horse to a sapling on the bank of the river:
tie, tie up, bind, tether, truss, fetter, lash, hitch, anchor, strap, rope.
▷antonyms unfasten, untie.
5 the dress fastens at the front with ten small buttons:
become closed, close, do up;
button (up), zip (up).
▷antonyms unfasten, undo.
6 his gaze fastened on me:
focus, fix, be riveted, concentrate, zero in, zoom in, be brought to bear;
direct at, aim at, point at.