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

plural of percussion lock

plural of wagon lock

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

plural of D lock

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

simple past tense and past participle of double-lock

Third-person singular simple present indicative form of double-lock

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

plural of safety lock