slubbing

slubslubs in a length of wool yarn

slub

S0484300 (slŭb)tr.v. slubbed, slub·bing, slubs To draw out and twist (a strand of silk or other textile fiber) in preparation for spinning.n.1. A soft thick nub in yarn that is either an imperfection or purposely set for a desired effect.2. A slightly twisted roll of fiber, as of silk or cotton.

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[Origin unknown.]