* Verb: This is the most common usage. It means to squeeze something tightly between your fingers.
* Example: "He pinched the dough to check its texture."
* Noun: It can refer to the act of pinching, or the amount something is pinched.
* Example: "He gave her a pinch on her cheek." (Act of pinching)
* Example: "Add a pinch of salt to the dish." (Amount)
* Adjective: It can mean small or tight, usually in the phrase "a pinch of."
* Example: "He only needed a pinch of sugar."
So, the part of speech of "pinch" depends on the context in which it's used.