Definition of "nab"

nab¹

/næb/

verb
third-person singular simple present nabs, present participle nabbing, simple past and past participle nabbed
1. (informal, transitive) To seize, arrest or take into custody (a criminal or fugitive).
  Quotations
  As I was going out of the door, a fellow detective came hurriedly in. "Nabbed them," cried he.
  1887, Anna Katharine Green, 7 to 12, A Detective Story, G. P. Putnam's Sons, page 2
  Their target: a drug kingpin who reportedly keeps millions of dollars in his fortress of a compound. Pope has been working for years to nab this baddie, and sincerely wants to stop his reign of terror,)
  2019 July 3, Mike D'Angelo, “Oscar Isaac and Ben Affleck blunder through a heavy heist in J.C. Chandor’s Triple Frontier”, in AV Club‎
2. (informal, transitive) To grab or snatch something.

nab²

/næb/

noun
plural nabs
1. The summit of a hill.
  Quotations
  At Clayton point and other nabs to the south of Scarborough.
  1828, George Young, A Geological Survey of the Yorkshire Coast
2. The cock of a gunlock.
  Quotations
  The Toe, or Nab of the Bolt, which rises […] above the Straight on the Top of the Bolt: The Office of this Nab, is to receive the Bottom of the Bit of the Key, when in turning it about, it shoots the Bolt backward or forwards.
  1677–1683, Joseph Moxon, “(please specify the page)”, in Mechanick Exercises, or The Doctrine of Handy-Works, […], volumes (please specify |volume=I or II), London: […] Joseph Moxon, published 1678–1683
3. (locksmithing) The keeper, or box into which the lock is shot.
  Quotations
  the Bottom of the Bit may fall almost to the Bottom of the Nab , and shoot the Bolt back
  1703, Joseph Moxon, Mechanick Exercises