Nit – GTO Wizard - Poker Glossary

A term that describes players that are considered to be very tight. For example, entering the pot with very few hands preflop. This concept also applies postflop where a "nit" only continues very tight. Being nitty preflop, however, does not necessarily mean being nitty postflop, although more often than not the tendency persists.

What is Nit in poker?