Third-person singular simple present indicative form of slather.(verb)
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Use "slathers" in a sentence
"There is nothing more frustrating than sitting down to a bowl of fruit while your significant other slathers butter on a slice of bacon and asks you to pass the half-and-half."
"As a bonus, Chao slathers plenty of icing on the cake."
"That's a description of a flying fish harmlessly jumping into a boat; just imagine how much Mr. Boyle slathers it on when, later in the chapter, the boat sinks."