c. 1400, probably of imitative origin; compare Frisian slobberje "to slurp," Middle Low German slubberen "slurp," Middle Dutch overslubberen "wade through a ditch." Related: Slobbered; slobbering. As noun from c. 1400 as "mud, slime," 1755 as "saliva." Congreve has slabber (v.), from Middle Dutch slabberen.
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