jerky

As a noun, this term refers specifically to a preserved food product. It is treated as an uncountable mass noun, meaning you cannot refer to "a jerky" to mean a single piece; instead, you must use partitive phrases such as "a piece of jerky" or "a bag of jerky" to specify quantity.

As an adjective, the word describes a lack of smoothness in motion. It carries a slightly negative or unstable connotation, often used to describe mechanical failure, nervousness, or poor coordination. It is distinct from "sudden," as it implies a series of repeated, irregular starts and stops rather than a single abrupt event.