I am done with being a life nit

What is the origin of the term nit ? Googling this has not provided an answer First came across it online

Used in poker to mean profitability in the long run exposed card: A card nit: A player who is unwilling to take risks and plays only premium hands

nitro circus slot But, what does “poker range” really mean, and how do you use it when you're If your opponent is a complete nit, you're not going to give them 98s

nitr068 Nits play as little as 5% of the hands they are dealt, and they are too quick to fold when they do get involved A nit generally engages preflop only with 99+,