Related Clues:

• Be dead wrong
• Make a goof
• Be human, perhaps
• Be human, so they say
• Louse up
• Go awry
• Muff an easy one
• Make a boner
• Do wrong
• Imperfect verb?
• Miss a cue, say
• Do the wrong thing
• Drop an easy one
• Get one's wires crossed
• Delude oneself