1. duty, occupation, activity Snp.158 (khīṇa of the Arahant: having no more duties, cp. vyappathi)
  2. way of speaking, speech, utterance Snp.163, Snp.164 (contrasted to citta & kamma; cp. kāya, vācā, mano in same use), explained at Snp-a.206 by vacīkamma; & in defn of “speech” at Vin.iv.2 (see under byappatha) Dhs-a.324 (explained as vākya-bheda).

perhaps a distortion of *vyāpṛta, for which the usual P. (der.) veyyāvacca (q.v.) in meaning “duty”