The general issue in the action of assumpsit; being a plea by which the defendant avers that “he did not undertake” or promise as alleged.

"Non-Assumpsit" is a term derived from Latin, used in law, which literally translates to "he did not undertake." It is a plea or defense strategy in contract law where the defendant claims that they did not agree to the contract or promise being alleged by the plaintiff. Essentially, it is a denial of the promise or obligation claimed in the lawsuit.