Source : Webster's Revised Unabridged Dictionary (1913)

Expound \Ex*pound"\ ([e^]ks*pound"), v. t. [imp. & p. p.
   {Expounded}; p. pr. & vb. n. {Expounding}.] [OE. exponen,
   expounen, expounden, fr. L. exponere to set out, expose,
   expound; ex out + ponere to put: cf. OE. expondre, expondre.
   See {Position}.]
   1. To lay open; to expose to view; to examine. [Obs.]

            He expounded both his pockets.        --Hudibras.

   2. To lay open the meaning of; to explain; to clear of
      obscurity; to interpret; as, to expound a text of
      Scripture, a law, a word, a meaning, or a riddle.

            Expound this matter more fully to me. --Bunyan.

Source : WordNet®

expound
     v 1: add details, as to an account or idea; clarify the meaning
          of and discourse in a learned way, usually in writing;
          "She elaborated on the main ideas in her dissertation"
          [syn: {elaborate}, {lucubrate}, {expatiate}, {exposit},
          {enlarge}, {flesh out}, {expand}, {dilate}] [ant: {abridge}]
     2: state; "set forth one's reasons" [syn: {set forth}, {exposit}]