wrong side
noun
- back side, reverse side
Wiktionary
noun
- The side of a fabric, often with a less visible color or pattern, that is not intended to be seen on a finished project.
“Trace the pattern on the wrong side so that any mistakes won't show when you're done.”
- Used other than figuratively or idiomatically: see wrong, side.
“Don't drive on the wrong side of the road.”
“But his grandson Francis, a Yorkist friend of Richard III, backed the wrong side in the Wars of the Roses and was declared a traitor by Henry VII, who confiscated his estates.”