Thumb latch

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a door latch having a lever formed to be pressed by the thumb.

See also: Thumb

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive
The thumb latch was sluggish, and he had trouble swinging out the cylinder and ejecting the live rounds.
The originals were probably painted, and required a bit of rope or a thumb latch to stay closed.
A low-profile, ambidextrous thumb latch releases the spring-loaded, tip-up barrel and automatically ejects the spent case, allowing for relatively quick reloads.
Among the improvements are 9mm and .45 ACP interchangeable barrels, an easier to operate thumb latch and a patent-pending sequentially fired trigger system with double strike capability that's been simplified to only four major components.
The ambidextrous thumb latch releases the action to eject the spent rounds.
The side plate bears the Power Grand Master logo with the Smith & Wesson logo on the thumb latch side of the gun.
An easy turn thumb latch holds the cutter closed, which protects the blade when the cutter is not in use.
"It includes some striking original features, such as the beautiful flagstone flooring and traditional thumb latch doors.
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