noun

• (uncountable) A mixture of a powdered mineral substance (often slaked lime (containing calcium hydroxide), chalk (calcium carbonate), or both) and water which is used for painting surfaces such as fences and walls bright white.
  "For walls plaster gave a smooth white surface; or if it was not sufficiently white, or had become discoloured, it could be brightened up with a coat of whitewash or paint."
• (countable, figurative)
  "“She has developed an arrogance of power,” Mr. Richardson said by telephone during a layover in Tokyo on his way back to New Mexico from Myanmar. “I’ve known her a long time and am fond of her, but she basically is unwilling to listen to bad news, and I don’t want to be part of a whitewash.”"
• (countable, figurative)
• (countable, figurative)
  "For the first time in a long time, Australia are being threatened with the prospect of a 5-0 whitewash"

verb

• (transitive)
  "The houses looked very bright after they had whitewashed the whole neighbourhood."
• (transitive)
  "If you appreciate historical accuracy and fair inclusion, don't go see this film [Stonewall (2015)]. If you don’t want to fuel the economy at another Hollywood attempt of whitewashing American history, don't give any aspect of this film a single dime or promotion."
• (transitive)
  "From Scarlett Johansson's heroine in the remake of the anime classic to Tilda Swinton as a Himalayan high priest in Doctor Strange, the film industry stands accused of whitewashing Asian characters and culture. Does it have a defence? [subtitle] […] Swinton replied that Dr Strange's writers were seeking to avoid the tired Orientalist stereotype of the "wise old Eastern geezer" or "Fu Manchu type". […] In other words, it was whitewashing in the name of diversity."
• (transitive)
  "One of Naomi Osaka's sponsors has been forced to apologise after depicting the Japanese tennis star, who is half-Haitian, with pale skin in an advertisement. […] The company said it had not intended to "whitewash" the athlete, […] The ad, which also features her compatriot Kei Nishikori, drew criticism on social media, with many users accusing Nissin of whitewashing Osaka, whose mother is Japanese."