n.

1. 【俚】（問題的）核心；基本的事實；本質
   I like doing business with people who get right to the nitty-gritty.

   我喜歡跟那種直截了當，一針見血的人做生意。

   Our two sides have agreed to cooperate from now on. Let's get down to the nitty-gritties.

   我們雙方都已同意以後要合作，現在讓我們談一下重要的細節吧。

n.