1. Fog intensified by smoke. Cf. photochemical smog n. at photochemical adj. Compounds.
2. figurative. A state or condition of obscurity or confusion; something designed to confuse or obscure.
smog mask n.
smog v. North American colloquial transitive (a) with out, up: to cover or envelop in smog; (b) with in: to confine or imprison because of smog; frequently passive.
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