'Blot' in the Bible

{To the chief Musician, A Psalm of David, when Nathan the prophet came unto him, after he had gone in to Bathsheba.} Have mercy upon me, O God, according to thy lovingkindness: according unto the multitude of thy tender mercies blot out my transgressions.

Hide thy face from my sins, and blot out all mine iniquities.

My acts of iniquity they overwhelm me! Our transgressions you blot them out!