‘A great lock’ (Jamieson).

a lock operating by three turns of the key.

A lock (for a door, etc.) of a type manufactured in or associated with France; esp. a lock with a complex tumbler mechanism, noted for its security.

a lock in which a number of grooved rings must be adjusted before the bolt can be drawn.

(a) a kind of lock which is opened by pressing with the thumb; (b) plural = thumbscrew, n. 2.

In sense 1, as bar-lock, etc.

= combination lock n. at combination, n. compounds 2.

(a) a small lock for closing the key-hole of a large lock, or otherwise securing a lock, bar, bolt, etc.; (b) (see quot.); so check-locking.

A lock having or operated by a pin; spec. (a) a lock having a pin on to which the hollow shank of a key fits; (b) a lock operated by a pin which…

a lock fitted with a device or mechanism which prevents its being unlocked until a set time.

(see quot.).

An ordinary lock which opens and shuts only with a key, as opposed to a spring lock; sometimes, locally, a padlock.

a lock fitted with a ‘seal’ (often a small square of glass) which must be broken before the lock can be opened.

(see quot. 1874).

a lock (esp. a door-lock) in which a pin tumbler mechanism is contained inside a cylinder barrel.

a device fitted in addition to a standard lock on a door or window to prevent it from being opened or to allow it to open only a certain distance.

A lock or fastener which prevents a zip from opening; a lockable zip.

A portable, heavy-duty lock used chiefly to secure a bicycle or motorcycle, consisting of a U-shaped metal bar which is fitted into a crosspiece.