Definitions

1. noun

A person who stifles or suppresses the expression of emotions or opinions, often in a way that is seen as annoying or oppressive.

“Her stiffler of a manager never let her express her true feelings about the project.”

2. noun

A device used to suppress or reduce the flow of a gas or liquid, especially in a steam engine or other mechanical system.

“The stiffler valve was replaced to improve the engine’s performance.”