A verb is a kind of word (part of speech) that tells about an action or a state. It is the main part of a sentence every sentence has a verb. In english, verbs are the only kind of word that changes to show past or present tense. Every language in the world has verbs, but they are not always used in the same ways. They also can have different properties in different languages.
(in traditional grammar) any of a large class of words in a language that serve to indicate the occurrence or performance of an action, the existence of a state or condition, etc. In english, such words as run, make, do, and the like are verbs 2.
As - english grammar today - a reference to written and spoken english grammar and usage - cambridge dictionary.
What is a verb? BBC Bitesize
A verb is a word used to describe an action, state or occurrence. Verbs can be used to describe an action, thats doing something.
A verb expresses a physical action (jump), a mental action (guess), or a state of being (exist). This page is a grammar lesson on verbs, the type of verbs, and verb terminology.
but if it is wrong to use impact as a verb, its a mistake which people have been making for centuries.