The document discusses the origins of several common English idioms: - "Foaming at the mouth" comes from descriptions of rabid dogs and Shakespeare referring to a king as being angry and foaming at the mouth. - "The apple of my eye" comes from the Bible referring to something being as precious as the pupil of an eye. - "Skeleton in the closet" originally referred to families attempting to conceal illnesses, and now means a hidden source of shame. - "A bone of contention" comes from dogs fighting over a single bone, and refers to an ongoing point of disagreement.