nail
UK: neɪl | US: neɪl
n. 1. A small metal spike with a broadened flat head, used to fasten things together.
n. 2. The hard keratinous covering on the upper surface of the tip of a finger or toe.
vt. 1. To fasten or attach with a nail.
vt. 2. (Informal) To catch or expose someone in wrongdoing.
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The word "nail" traces back to Old English nægl, which referred both to the metal fastener and the anatomical feature. This dual meaning reflects Proto-Germanic naglaz (from Proto-Indo-European h₃nogʰ-, "nail/claw"). The shared logic lies in the concept of a hard, protruding object—whether artificial (metal nail) or natural (fingernail). Over time, the verb forms emerged metaphorically, e.g., "nailing" a task (success) or "nailing" a suspect (capturing).
He hammered the nail into the wooden plank.
She painted her nails bright red for the party.
The detective finally nailed the thief with solid evidence.
(Informal) You totally nailed that presentation!
Trim your nails regularly to maintain hygiene.