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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.
4 using diesel exhaust fluid Diesel exhaust fluiD (Def) Diesel Exhaust Fluid (DEF) is a non-flammable fluid comprised of 33% ammonia-based urea and 67% purified water. DEF is used with diesel engine exhaust systems to reduce the amount of emissions produced by turning Nitrogen Oxide (NOx) into nitrogen and water vapor.