To deprive of the use of some part of the body by wounding or the like; cripple: (Dictionary.com)
To impair; make essentially defective: (Dictionary.com)
Wound or injure (a person or animal) so that part of the body is permanently damaged. (Oxford Dictionaries)
To commit the felony of mayhem upon. (Merriam – Webster)
To mutilate, disfigure, or wound seriously. (Merriam – Webster)
To injure a person so severely that a part of their body will no longer work as it should. (Cambridge Dictionary)
To maim someone means to injure them so badly that part of their body is permanently damaged. (Collins Dictionary)
Israel: ‘Deliberate attempts’ by military to kill and maim Gaza protesters continues.
Kill a Friend, Maim a Mate Sweepstakes (World Edition).
Meaning of maim.