A hasp is a flat piece of metal, usually on a hinge, that you fold over a loop to shut a door, a lid, a chest, or a gate. Often you then push a padlock through the loop so the hasp cannot be lifted. You see hasps on old wooden chests, garden sheds, toolboxes, and barn doors — quiet hardware-shop English, not slang and not emotional. It is not the lock itself; it is the metal flap that works with the lock. There is also a verb, to hasp, meaning to fasten something with a hasp, but the noun is the sense you will meet most. People who do not work with tools may go their whole lives without saying the word, then need it the day a shed door will not stay shut.

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