Whitewash (verb)

1. To cover up or gloss over (something) by giving a false or misleading account of it.
2. To paint or cover (a surface) with whitewash.

Origin:

From the words "white" meaning "having the color of snow or milk" and "wash" meaning "to clean or cover with a liquid such as water or paint".

Examples:

1. The government was accused of whitewashing the scandal.
2. He was trying to whitewash his past.
3. The company was accused of whitewashing their environmental record.
4. The walls were whitewashed to freshen up the room.
5. The shed was whitewashed to protect it from the elements.