Definition of "whitewasher" [white•wash•er]

• One who, or that which, whitewashes. (noun)

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• "During the latter he became enmeshed in a bitter feud with Joe McCarthy, who accused Morgan of being a skilled "whitewasher" of embarrassing secrets."
• "Whoever says Harry Reid did a brilliant job is a whitewasher."
• "Incidentally, Lee Hamilton who chaired the House Select Committee to investigate this probably helped negotiate a ceasefire, which is why he keeps getting asked to chair 'bi-partisan' commissions like the 9/11 or Iraq Study Group ... as a professional whitewasher."