The oracular side of Apollo was also called Double-Tongued, because one could never be quite sure about the meaning of the answer. Everything depended upon the level of interpretation.
Greene identifies the Delphic epithet ‘Double-Tongued’ as the defining marker of oracular ambiguity, arguing that the indeterminacy of Apollo’s responses is structurally analogous to the multi-levelled meanings of dreams.
, The Luminaries: The Psychology of the Sun and Moon in the Horoscope, 1992thesis