What is "negative verb"

n. An auxiliary verb used for negation in certain languages.

A negative verb or negation verb is a type of auxiliary that is used to form the negative of a main verb. The main verb itself has no personal endings, while the negative verb takes the inflection. The English auxiliary don't/doesn't performs a similar function by acting as a negative verb that indicates whether one or multiple individuals are involved while the verb referring to the negated activity remains uninflected, e.g. "he cares"/"we care" versus "he doesn't care"/"we don't care".