Spreads butter on something (the verb form), or plural of butter (the noun); slang can also mean 'ruins' or 'messes up' something.
From the noun 'butter' (Old English 'butere,' from Latin 'butyrum'), with the '-s' making it third person singular present tense (he/she/it butters) or plural.
Butter is one of humanity's oldest foods—people have been making it by agitating cream for thousands of years, but it wasn't until modern chemistry that we understood why shaking cream separates the fat from the liquid!
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