Etymology
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slather (v.)

"spread liberally," 1847, of uncertain origin. Early 19c. local glossaries from western England have the word with a sense "to slip or slide."

Slather on the manure on all the hoed crops, if you have it; if not buy of your improvident neighbor. [Genesee Farmer, June 1847]

Sometimes said to be from a dialectal noun meaning "large amount" (usually as plural, slathers), but this is first attested 1855. Related: Slathered; slathering.

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Definitions of slather

slather (v.)
spread thickly;
I can't eat bagels without slathering them with cream cheese
From wordnet.princeton.edu