Related Clues:

• Barks up the wrong tree
• Is fallible
• Stumbles or bumbles
• Calls Mary Larry, e.g.
• Plays a wrong note
• Flubs it
• Goes the wrong way, say
• Makes a mistake
• Gets it all wrong
• Writes ''hiar'' for ''hair,'' e.g.
• Goes awry
• Makes a blunder
• Has it wrong
• Slips a cog
• Bobbles