To take the wind out of the sails of (another vessel) by sailing to windward of it.
To nullify the impact of (someone or something).
Of a radiosignal: to override or block out another radio signal.
Origin
From Middle English blanket, blonket, from Old Northern French blanket, blankete, blanquette (Modern French blanchet), diminutive of blanc. More at blank. Apparently cognate to blunket, plunket.
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