Related Clues:

• Blow one's lines, e.g
• Do away with chalk
• Start a correction process
• Remove chalk from
• Miss an easy grounder, say
• Act human, proverbially
• Eliminate, as chalk
• Miscalculate or misspeak
• Prove oneself fallible
• Utilize the backspace key
• Affirm one's humanity?
• Do math incorrectly, e.g
• Scrub off
• Make an incorrect choice, e.g
• Miss an easy spare, say