whitewash

1. 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. (uncountable) · Near-synonym: limewash (often coinstantial)
2. A thing used to hide mistakes, or to create an appearance of honesty, propriety, etc.; also (often politics), an act of hiding mistakes or creating an appearance of honesty, propriety, etc.; especially, a campaign, investigation, etc., which intentionally hides or overlooks unfavourable facts. (countable, figuratively, uncountable)
3. An act of clearing a person's debts, especially through a declaration of bankruptcy by a court. (countable, figuratively, uncountable)
4. A complete victory or series of victories without suffering any losses; a clean sweep; also, a victory or series of victories by a very large margin. (countable, figuratively, uncountable)
5. The most basic type of thickening agent, consisting of flour blended with water to make a paste. (uncountable)
6. A preparation for making the skin look lighter. (countable)

Plural whitewashes