a necessary or essential thing, New wine; the unfermented juice as pressed from the grape, The quality or condition of being stale or musty, intransitive verb_ To be obliged or required by morality, law, or custom, Used to express a command or admonition, To be required or obliged to go, transitive verb_ To make musty, verb_ modal auxiliary, defective to do with certainty; indicates that the speaker is certain that the subject will have executed the predicate, modal auxiliary, defective to do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a negative consequence, adjective_ highly recommended