Related Clues:

• Drop of a swatted fly, e.g.
• Miscalculation
• Misplay, say
• Run out, as a policy
• Minor failing
• End, as a subscription
• Calculator message
• Word on computer screens, sometimes
• Concentration problem
• Become invalid
• Mini-mistake
• Gap, as in judgment
• Baseball goof
• What computers repeat out loud while shooting sparks, in old sci-fi movies
• Terminate, as an insurance policy