stop (a lawsuit or the plaintiff bringing it), either by voluntary withdrawal by the plaintiff, or by a finding by the judge that the plaintiff has failed to make a legal case or bring sufficient evidence:another action where the plaintiff has been nonsuited
an instance of nonsuiting a lawsuit or the plaintiff bringing it.
late Middle English (as a noun): from Anglo-Norman French, literally 'not pursuing' (see non-, suit)
nonsuit in other Oxford dictionaries
Definition of nonsuit in the US English dictionary