Vous ne devriez pas bouger.
(You-all should not move)
Vous is a pronoun meaning "you-all" as in second person plural "we".
devoir is a verb meaning "must / have to".
ne ... pas is a negation form. When you make a negative sentence, you use "ne ... pas". In this case, if we wouldn't use "ne ... pas" form in the sentence, "vous devriez bouger" would mean "you-all should move". But because the negation form is used, it means the opposite.
bouger is a verb meaning "to move". These are present indicative conjugations of bouger:
je bouge (I move)
tu bouges (you move)
il/elle bouge (he/she/it moves)
nous bougeons (we move)
vous bougez (you-all move)
ils/elles bougent (they move)