What is Pinch ?
Pinch is (noun) 1. squeezing tightly between finger and thumb He gave her arm a pinch. 2. at a pinch if really necessary At a pinch, we can manage with only one sales assistant. to feel the pinch to find you have less money than you need We really started to feel the pinch when my father lost his job. 3. a small quantity of something held between finger and thumb Add a pinch of salt to the boiling water. (NOTE: The plural is pinches.) (verb) 1. to squeeze something tightly, using the finger and thumb Ow! You’re pinching me! 2. to steal something Someone’s pinched my pen!
source: Easier English, Student Dictionary Upper Intermediate Level