noun
plural nails
[count] a long, thin piece of metal that is sharp at one end and flat at the other end and that is used chiefly to attach things to wood
the hard covering at the end of a finger or toe :a fingernail or toenail
a nail in the/someone's coffin
something that makes it more likely that someone or something will fail, be destroyed, etc.
(as) hard/tough as nails
of a person :very tough
hit the nail on the head
tooth and nail
verb
nails; nailed; nailing
[+ obj] always followed by an adverb, adjective, or preposition :to attach (something) with a nail
informal
to catch (someone) doing something illegal or wrong
to arrest or punish (someone) for doing something that is illegal or wrong
informal :to hit (someone or something) forcefully
US informal :to make or do (something) in a perfect or impressive way
nail down
[phrasal verb]
nail (something) down or nail down (something)
to make (something, such as a victory) certain to happen
to find out or identify (something) exactly
to make (something) definite or final