whitewash
noun
°A lime and water mixture for painting walls and fences bright white.
"1952: 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. — L.F. Salzman, Building in England, p. 157."
°A complete victory or series of victories without suffering any losses; a clean sweep.
verb
°To paint over with a lime and water mixture so as to brighten up a wall or fence.
"The houses looked very bright when they whitewashed the whole neighborhood."
°To cover over errors or bad actions.
"In his sermon, the minister didn't try to whitewash over the sins of his church."