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

nitpicker

Someone who is overly inclined to point out or complain about every flaw they come across (in or about something), no matter how small, petty, or insignificant. Sometimes hyphenated or spelled as two separate words. You might write me off as just a nitpicker, but you'll appreciate it when you get an A+ on this paper. This is why I hate going to the movies with nit-pickers like you. Instead of just enjoying what we watch, you have to criticize every little flaw you can think of!

nitpicking

An act or instance of pointing out or complaining about every flaw that one comes across (in or about something), no matter how small, petty, or insignificant. Sometimes hyphenated. You might disregard my points as just nitpicking, but you'll appreciate it when you get an A+ on this paper. This is why I hate going to the movies with you. Instead of just enjoying what we watch, you spend the whole time nit-picking!

pick nits

To look for and point out small, trivial, or insignificant problems, issues, or faults to criticize; to nitpick. I know I'm picking nits, but the color of your character's bandana changes slightly about three times over the course of the movie—it was really distracting! Look, your essay was really strong and very well put together on the whole. I'm just picking nits so that you can polish your next essay to an even higher standard.
See also: nit, pick
Farlex Dictionary of Idioms.

pick nits

If someone picks nits, they point out small, unimportant problems or faults in something. If I had to pick nits, I'd say the service could be a little quicker. That aside, it was pretty much perfect. Note: The verb nitpick has a similar meaning, and there is also a much more frequent noun nitpicking. The critics, of course, nitpick — that's what they do. The book was the subject of seemingly endless academic nitpicking. Note: Nits are the sticky eggs laid by the head louse, a small insect that lives and breeds in human hair.
See also: nit, pick
Collins COBUILD Idioms Dictionary, 3rd ed.

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

pick nits

look for and criticize small or insignificant faults or errors.
The image here is of the painstaking removal of tiny parasitic nits (lice or lice eggs) from someone's hair. The phrase originated in the mid 20th century, chiefly in North American usage.
See also: nit, pick
Farlex Partner Idioms Dictionary

nit-picker

n. a person who is hypercritical. Mary is such a nit-picker!

nit-picking

n. too much minor criticism; overly particular criticism; nagging. Enough nit-picking! What are the major problems?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

pick nits

To find fault in a petty way; nitpick.
See also: nit, pick
American Heritage® Dictionary of the English Language, Fifth Edition.

nitpicker

Someone who bothers with tiny, trivial, unimportant details, in effect looking for mistakes. “Nit” alludes to the tiny eggs of the louse. The term dates from the mid-1900s.
The Dictionary of Clichés by Christine Ammer
See also:
  • keep 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)
  • keep eyes
  • keep one's eyes open
  • keep your eyes open
  • keep your eyes open/peeled/skinned
  • skinned
References in periodicals archive
NIT Islamic Pension Fund - Money Market###September 04, 2019###(NIT-IPFMSF)###12.0466
NIT has declared a per unit cash dividend Rs0.5348 (for full year) for unit holders of NIT Government Bond Fund for the year ended on 30th June 2018.
Nesse contexto, a Secretaria de Estado da Saude de Sao Paulo (SES-SP), em 2012, decidiu operacionalizar a criacao dos Nucleos de Inovacao Tecnologica (NIT) nos institutos de saude por meio de um programa inicial de atuacao acordado entre a Coordenacao de Ciencia, Tecnologia e Insumos Estrategicos (CCTIES) e a Fundacao Instituto de Administracao (FIA), o qual foi desenvolvido ao longo de tres eixos estruturantes e articulados.
He asked the NITs to take steps to fill up the vacant posts in a time bound manner, and also called upon the Ministry of Human Resource Development to take measures for providing flexibility to NITs in hiring outstanding candidates from industry, foreign universities, and national laboratories as visiting and adjunct faculty.
It may be mentioned that the "temporary campus" for the NIT, Nagaland would use the building which was earlier constructed for DC's office at Chumukedima.
Scope and Limitations--The study was confined to India's 20 NIT libraries, concerning only the library automation facilitation.
Brian Neugeboren of The Hunter Realty Organization represented NIT in the lease negotiations.
Next came the very fine nit comb and, I must say, I generally enjoyed the combing through of the hair (except when a tat was caught ( that hurt).
And remember this: In the past two season, the NIT fields have included five teams that had .500 records, either 14-14, 15-15 or 16-16 when they were selected.
The persistent confusion of nits (and nit look-alikes) with an active lice infection has led to significant social and health consequences.
To minimize lice infestation, many US schools adopted no nit policies that prohibit student participation in school activities until all nits are successfully removed.
The total yield on the NIT unit for 2001-02 would come to 37.9 per cent including a dividend yield of 13.6 per cent.
Well-In-Hand Herbals' Non-Toxic Nit Kit ($18.99) includes an easy-to-use herbal formula made of essential oils that smother and kill lice.
NIT - Income Fund (NIT-IF)###September 03, 2019###10.4055###10.3025