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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 a non-hazardous solution, which is 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles to break down dangerous NOx emissions into harmless nitrogen and water.