Possible Clues:

• Fall over last letters found in upturned place
• Fall over getting gash in upside-down place
• Go wrong, putting last message into place the wrong way round
• (Cause to) stumble
• Expose lie in rising place around Split
• Keep from succeeding
• Journey over, make mistake
• Make a mistake in flight, it's inferred
• Throw off
• Cause person to stumble, or detect in error