Transitive verb: to say untrue or malicious things about someone or something, to defame, slander, vilify.
Pierre Guesnon is a retired engineer who founded and ran an engineering company in Boston for many years, until he retired fifteen years ago. Since then, he has lived most of each year on Marco Island. He is married to an Australian, Margaret Guesnon, whom he met in London and married in Sydney. They have two daughters. Pierre has had a lifelong interest in words and language.