Wiktionary
disabler
n. One who, or that which, disables.
Usage examples of "disabler".
For example, Zim could have feinted at one of them, bounced fast to the other with a disabler, such as a broken kneecap then finished off the first at his leisure.
Two minutes earlier Jake had felt compelled to use a disabler on the andy because she was asking questions he wasn't prepared to answer.