The word "wert on back of" may seem like a phrase with incorrect spelling. However, it is actually a Middle English phrase that means "were on the back of." The spelling of "wert" is an archaic form of "were," which means "was" or "were." The pronunciation of "wert" is [wɜrt], with the "e" sound pronounced like "her" or "fir." So, if you come across this unusual phrase in a historical text, now you know its meaning and how to pronounce it!