Blow-out n. The cleaning of the flues of a boiler from scale, etc., by a blast of steam.
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  blowout
       n 1: an easy victory [syn: runaway, romp, laugher, shoo-in,
             walkaway]
       2: a sudden malfunction of a part or apparatus; "the right
          front tire had a blowout"; "as a result of the blowout we
          lost all the lights"
       3: a gay festivity [syn: gala, gala affair, jamboree]