Related Clues:
- Misspell a word, e.g
- Make the wrong move
- "Oops!" evoker
- Blow one's lines, e.g
- Miss an easy grounder, say
- Act human, proverbially
- Clown (around)
- Miscalculate or misspeak
- Prove oneself fallible
- Affirm one's humanity?
- Do math incorrectly, e.g
- Make an incorrect choice, e.g
- Miss an easy spare, say
- Not be right
- Require a 110-Across, maybe