It would only make sense if a very specific context has already been established. If, for instance, someone is considering contrasting claims about whether or not flowers should be planted/used/purchased/gathered for some reason, then an expert who wants to argue against the use of flowers might be called "an authority (who is) against flowers." As a free-standing sentence, though, it doesn't ma
Tom likes to take photographs of people against a natural background. Yesterday he photographed me against a background of trees. Then he photographed an authority against flowers. The flowers made a nice background. The a