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."