D defs.my
Entry 1 sense Webster, 1913

Unnerve

/ən-ẽrv'/ · Un·nerve · IPA /ʌnˈnɜː(ɹ)v/
01 v. t. To deprive of nerve, force, or strength; to weaken; to enfeeble; as, to unnerve the arm.
  1. 1.
    To deprive of nerve, force, or strength; to weaken; to enfeeble; as, to unnerve the arm.
    “Unequal match'd, . . . The unnerved father falls.” Shak.