upon [opon] adv

see upon, prep.

  1. About; over; with attention to.
  2. At; toward; in the direction of.

upon [opon] prep

ME; see up, adv. + on, adv.

  1. On; using; standing upward with.
  2. On; in contact with; at the point of.
  3. Affecting; opposing; up against; grating on.
  4. During.