n. & v.
n. 1 a lack of order; confusion. 2 a riot; a commotion. 3 Med. a usu. minor ailment or disease.
v.tr. 1 throw into confusion; disarrange. 2 Med. put out of good health; upset.
[ ME, alt. after ORDER v. of earlier disordain f. OF desordener (as DIS-, ORDAIN) ]