A "verb" is a word that describes an action, occurrence, or state of being. In sentences, verbs serve as the core of the predicate and are essential for expressing what the subject is doing or what is happening to it. For example, in the sentence "She runs every morning," the word "runs" is the verb, indicating the action performed by the subject "She."
The word "verb" comes from the Latin word "verbum," which means "word." Its usage in English has been established since the late Middle English period.