Topic: POLICE
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nail2 [transitive]
1 [always + adverb/preposition]T to fasten something to something else with nails
nail something up (=permanently close a window or door by fixing something across it using nails) 
The windows had been nailed up.
The windows had been nailed up.2 informalSCP to catch someone and prove that they are guilty of a crime or something bad : It took us 10 years to nail the guy who killed our daughter.
It took us 10 years to nail the guy who killed our daughter.3 informal if you nail something, you succeed in getting it, after a lot of time or effort : She finally nailed her dream job.
She finally nailed her dream job.5PP to say clearly and publicly which ideas or which people you support
nail your colours to the mast
British Englishnail somebody/something ↔ down
phrasal verb1 to reach a final and definite agreement or decision about something : Two days isn't enough time to nail down the details of an agreement.
Two days isn't enough time to nail down the details of an agreement.2 to force someone to say clearly what they want or what they intend to do
