keep nit

keep nit

old-fashioned To remain vigilant or carefully watchful (for something or someone); to act as a guard or watch. The gang employed youths from the area to keep nit and give a signal if any police officers arrived. I offered to keep nit at the door, as I had no intention of risking my life in that creepy old house.
See also: keep, nit
Farlex Dictionary of Idioms.

keep nit

keep watch or act as a guard. Australian
Nit here is possibly an alteration of nix , a warning signal by schoolchildren that a teacher is approaching.
See also: keep, nit
Farlex Partner Idioms Dictionary
See also:
  • nit
  • keep cave
  • keep eye out
  • keep (one's) eye(s) out (for something or someone)
  • keep (one's) eye(s) open (for someone or something)
  • skinned
  • keep eyes open
  • keep one's eyes open
  • keep your eyes open
  • keep your eyes open/peeled/skinned