whitewash
A lime and water mixture for painting walls and fences bright white.
(sports) A complete victory or series of victories without suffering any losses; a clean sweep.
(politics) A campaign to paper over unfavorable elements.
(cooking) The most basic type of thickening agent, flour blended with water to make a paste.
(obsolete) Any liquid composition for whitening something, such as a wash for making the skin fair.
(UK, slang, obsolete) A glass of sherry as a finale, after drinking port and claret.
To paint over with a lime and water mixture so as to brighten up a wall or fence.
(figurative) To cover over errors or bad actions.
(dated) To repay the financial debts of (another person).
(baseball, slang, dated, late 19th century, archaic) To prevent a team from scoring any runs.
(US, UK, slang) In various games, to defeat (an opponent) so that they fail to score, or to reach a certain point in the game; to skunk.
(derogatory) To make over (a person or character, a group, an event, etc) so that it is or seems more white, for example by applying makeup to a person, or by discounting the participation of people of color in an event and focusing on only white participation.