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|Noun||1.||pin tumbler - cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown|
cylinder lock - a lock in which a cylinder rotates to move a bolt; tumblers are pins; inserting the key lifts and aligns the pins to free the cylinder to rotate
tumbler - a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown