(firearms) A kind of lock for a gun in which a hammer strikes upon a percussion cap on the nipple, igniting the charge.

(rail transport) a locomotive powered by a diesel engine, probably the most common type of locomotive today.

(slang) A type of boastful, lurid, chauvinistic conversation that commonly takes place in all-male locker rooms, especially such conversation concerning sexual conquests and the like.

(geography) An arm of the sea, similar to a Norwegian fjord and to a firth. Most sea lochs are on the west coast of Scotland, Loch Torridon is one example.

A village on the outskirts of Weston-super-Mare. Somerset, England / A surname.

An iron shoe placed on the rear wheel of a wagon to retard motion in going downhill.

A lock shaped like an elongated letter D, used to secure an unattended bicycle to railings etc.

present participle of double-lock

(transitive) To lock with two separate locks or bolts. / (transitive) To lock by two turns of the key.

A lock that cannot be picked by ordinary means. / (firearms) A lock with some device for preventing accidental firing of the weapon.