e/Gates of horn and ivory

Information
has gloss	eng: The gates of horn and ivory are a literary image used to distinguish true dreams (corresponding to factual occurrences) from false. The phrase originated in the Greek language, in which the word for "horn" is similar to that for "fulfil" and the word for "ivory" is similar to that for "deceive". On the basis of that play on words, true dreams are spoken of as coming through the gates of horn, false dreams as coming through those of ivory.
lexicalization	eng: gates of horn and ivory
instance of	(noun) a figure of speech in which an expression is used to refer to something that it does not literally denote in order to suggest a similarity metaphor