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lubricant /ˈluːbrɪkənt/  

  • noun
    plural -cants
    [count, noncount] :a substance (such as grease or oil) that causes something (such as a machine part) to be slippery and to move more smoothly
    The car's axles need more lubricant.
    [count] :something that makes it easier for people to work or talk with each other
    using humor as a social lubricant