whitewash

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.

For the first time in a long time, Australia are being threatened with the prospect of a 5-0 whitewash

“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.”

I have heard a whole Sermon against a White-wash.

The bottles, however, were port bottles, but contained mushroom ketchup; and we can only say with regard to the 15s. sherry, that it would have made an admirable "whitewash," as Sheridan's glass is still sometimes called, […]