Hold fast
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A hold fast is an accessory used on a woodworking workbench to fix a workpiece to the top or side of the bench while it is being worked.
A hold fast is shaped like a shepherd's hook. In use, the shank fits into a hole in the top or side of the bench and the tip of the hook is pressed against the work. The hold fast is set by rapping the top with a mallet and is released by hitting the back side. A good holdfast works remarkably well, and is inexpensive and easy to install.
A holdfast is also a plinth or pedestal, usually of concrete, to which an anti aircraft or coastal battery gun was fitted. Holdfasts are often the only evidence for a weapon which survive.
To ‘hold fast’ – military or nautical term meaning to stand where you are ‘Hold fast’ – showing courage