The Collaborative International Dictionary of English v.0.48:
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.
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.