A false friend

Origin

In 1928, French linguists Maurice Koessler and Jules Derocquigny coined the term 'faux ami' (false friend) in their influential book 'Les Faux Amis ou Les Pièges du Vocabulaire Anglais'. They used it to describe words that looked deceptively similar in French and English but carried entirely different meanings—linguistic traps for unsuspecting learners. This brilliant, evocative phrase quickly translated directly into English as 'false friend,' becoming a cornerstone of language study. Yet, the phrase resonated far beyond academic circles because it tapped into a much older, more fundamental human experience: the bitter disappointment of a person who appears loyal and supportive, only to reveal themselves as deceitful and harmful. Thus, the vivid academic term found a second, more expansive life, perfectly encapsulating the universal pain of a betrayal disguised as friendship.