*nail¹/nel; neɪl/ n [C] 1 a thin pointed piece of metal with a flat end, that you hit with a hammer 钉子 2 the thin hard parts that grow on the top end of your fingers and toes 指甲; 趾甲: Stop biting your nails! 别咬指甲了！ → see also 另见 hit the nail on the head (HIT¹)