D defs.my
Entry 2 senses Webster, 1913

Perturb

/pẽrt-ẽrb'/ · Per·turb · IPA /pəɹˈtɜɹb/
01 v. t. To disturb; to agitate; to vex; to trouble; to disquiet.
  1. 1.
    To disturb; to agitate; to vex; to trouble; to disquiet.
    “Ye that . . . perturb so my feast with crying.” Chaucer.
  2. 2.
    To disorder; to confuse.[R.]