"Stink out" is an expression often used to describe unpleasant smells that permeate a space or area. However, there are many different synonyms for this phrase that can be used to vary your language. Some options include "reek," "foul odor," "fetid smell," "stinky stench," and "putrid aroma." Another way to describe a strong and unpleasant smell could be to say something "smells like rotten eggs," or simply "smells bad." No matter which synonym you choose, it's important to communicate effectively to help others understand the nature and intensity of the offensive smell.