Definition of "Perturb" :

verb: throw into great confusion or disorder

"Fundamentalists threaten to perturb the social order."

verb: disturb in mind or make uneasy or cause to be worried or alarmed

"She was rather perturbed by the news that her father was seriously ill."

verb: cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull

"The orbits of these stars were perturbed by the passings of a comet."

verb: disturb or interfere with the usual path of an electron or atom

"The electrons were perturbed by the passing ion."