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Lube (noun): A shortened form of the word “ lubricant ,” referring to a substance used to reduce friction between surfaces in mutual contact, which ultimately decreases the heat generated when the surfaces move. /lub/ IPA guide Other forms: lubed ; lubing; lubes Definitions of lube noun a substance capable of reducing friction by making surfaces smooth or slippery synonyms: lubricant, lubricating substance, lubricator The meaning of LUBE is lubricant. How to use lube in a sentence. To lubricate (a car's joints, for example). n. A lubricant , such as one applied to machinery: silicone lube . [Shortening and alteration of lubricant and lubricate .] American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company.