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Full Definition of LANGUISH. intransitive verb. 1. a: to be or become feeble, weak, or enervated b: to be or live in a state of depression or decreasing vitality. 2. a: to become dispirited. 3. : to assume an expression of grief or emotion appealing for sympathy.
Diesel Exhaust Fluid (DEF) is an emissions control liquid required by modern diesel engines. It is injected into the exhaust stream. DEF is never added to diesel fuel. It is a non-hazardous solution of 32.5% urea in 67.5% de-ionized water. DEF is clear and colorless, and looks exactly like water. It has a slight smell of ammonia, similar to some home cleaning agents.