Coated with grease or oil, or the past tense of 'grease' meaning to apply a slippery substance to something.
From Old French 'graisse,' from Latin 'crassus' meaning 'thick' or 'fat.' The word originally referred to animal fat and evolved to mean any oily substance.
The phrase 'greased lightning' comes from the old idea that greased objects move faster—this led to the famous musical, but the actual physics shows friction reduction was a real concern for early machinery!
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