The Collaborative International Dictionary of English v.0.48:

Dine \Dine\, v. i. [imp. & p. p. Dined; p. pr. & vb. n.
   Dining.] [F. d[^i]ner, OF. disner, LL. disnare, contr. fr.
   an assumed disjunare; dis- + an assumed junare (OF. juner) to
   fast, for L. jejunare, fr. jejunus fasting. See Jejune, and
   cf. Dinner, D?jeuner.]
   To eat the principal regular meal of the day; to take dinner.
   [1913 Webster]

         Now can I break my fast, dine, sup, and sleep. --Shak.
   [1913 Webster]

   To dine with Duke Humphrey, to go without dinner; -- a
      phrase common in Elizabethan literature, said to be from
      the practice of the poor gentry, who beguiled the dinner
      hour by a promenade near the tomb of Humphrey, Duke of
      Gloucester, in Old Saint Paul's.
      [1913 Webster]