Lewis & Short

offenso, āvi, ātum, 1, v. freq. a. [1. offendo], to strike or dash against (not in Cic. or Caes.).

  1. I. Lit.: sponte suā offensando ut semina rerum, Lucr. 2, 1059; so id. 6, 1053: omnes offensare capita, dash their heads against the wall, Liv. 25, 37.
  2. II. Trop., to stumble, trip, falter in speaking, Quint. 10, 7, 10.
    (Offensatus, Quint. 10, 3, 20, is a false reading for offensator, q.v.).