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French word brouillard comes from French brouiller
brouiller (French)
(reflexive) to become blurred, get mixed up. (reflexive, meteorology) to cloud over. (reflexive, ~ avec) to fall out. To blur. To jam (a transmission), to scramble (a message). To mix up, confuse. To scramble (an egg). To set at odds, put (someone) off (something).
brouillard (French)
(finance) daybook. Fog, mist.