Suggest upside down

Author: jsoref

.github/actions/spelling/line_forbidden.patterns

@@ -541,6 +541,9 @@ socio-economic
 # Should be `understand`
 \bunder stand\b
 
+# Should be `upside down`
+\bup side down\b
+
 # Should be `URI` or `uri` unless it refers to a person named `Uri` (or a flag)
 (?<![-\.])\bUri\b(?![(])