Lewis & Short

concussĭo, ōnis, f. [concutio] (post-Aug.), a shaking, concussion.

  1. I. In gen.: vasorum, Col. 9, 14 fin.: assidua facium, Plin. Ep. 4, 9, 11: vasta concussio quae duas suppressit urbes, an earthquake, Sen. Q. N. 6, 25, 4.
  2. II. In jurid. Lat., an extortion of money by means of threats, Dig. 47, 13: de concussione, several times; also Tert. ad Scap. 4 sq.