nail/neɪl/

n C

1. 钉子

• hammer a nail into the wall 把钉子钉入墙中

2. 指甲

• trim the nails 修剪指甲

词组a nail in sb.'s (或sth.'s) coffin 加速某人死亡(或某事失败)的东西 (as) hard(或tough) as nails 铁石心肠的

• They are merciless with hearts as hard as nails. 他们是铁石心肠，冷酷无情。

on the nail

1. 英 立即

• pay the money on the nail 立即付款

2. 完全正确