Collins Concise English Dictionary © HarperCollins Publishers::
butter up vb
  1. (tr, adverb) to flatter
WordReference Random House Learner's Dictionary of American English © 2020
but•ter /ˈbʌtɚ/USA pronunciation   n. 
    [uncountable]
  1. Fooda soft whitish or yellowish fat that is separated from milk or cream when it is churned, used as a spread and in cooking.
  2. Foodany of various other soft spreads for bread or for baking:apple butter.

v. [+ object]
  1. Foodto put butter on or in:He buttered the toast.
  2. Informal Termsbutter up, to flatter or praise (someone) too much: [+ object + up]buttered her up by telling her what a great boss she was.[+ up + object]He liked to butter up every new boss he had.

WordReference Random House Unabridged Dictionary of American English © 2020
but•ter  (butər),USA pronunciation n. 
  1. Foodthe fatty portion of milk, separating as a soft whitish or yellowish solid when milk or cream is agitated or churned.
  2. Foodthis substance, processed for cooking and table use.
  3. Foodany of various other soft spreads for bread:apple butter; peanut butter.
  4. Foodany of various substances of butterlike consistency, as various metallic chlorides, and certain vegetable oils solid at ordinary temperatures.

v.t. 
  1. Foodto put butter on or in;
    spread or grease with butter.
  2. to apply a liquefied bonding material to (a piece or area), as mortar to a course of bricks.
  3. Metallurgyto cover (edges to be welded together) with a preliminary surface of the weld metal.
  4. butter up, [Informal.]to flatter someone in order to gain a favor:He suspected that they were buttering him up when everyone suddenly started being nice to him.
butter•less, adj. 
butter•like′, adj. 
  • Greek boútȳron
  • Latin būtȳrum
  • bef. 1000; Middle English; Old English butere

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