to hint at

from The Collaborative International Dictionary of English v.0.48

Hint \Hint\, v. i.
   To make an indirect reference, suggestion, or allusion; to
   allude vaguely to something.
   [1913 Webster]

         We whisper, and hint, and chuckle.       --Tennyson.
   [1913 Webster]

   {To hint at}, to allude to lightly, indirectly, or
      cautiously.

   Syn: To allude; refer; glance; touch.
        [1913 Webster]