Related Clues:

• Boot on a diamond
• Slip on a slip
• Foul-up on a pop-up
• Dropped fly ball, e.g.
• Drop of a swatted fly, e.g.
• Editor's annoyance
• Miscalculation
• Misplay, say
• Tit for tat, for example?
• Calculator message
• Error in print
• Word on computer screens, sometimes
• Reason to backspace
• Baseball goof
• What computers repeat out loud while shooting sparks, in old sci-fi movies