Simple Definition of perturb
: to cause (someone) to be worried or upset
Examples of perturb
It perturbed him that his son was thinking about leaving school.
<the caller's strange remark perturbed me enough to keep me awake that night>
Origin of perturb
Middle English, from Middle French perturber, from Latin perturbare to throw into confusion, from per- + turbare to disturb — more at turbid
First Known Use: 14th century
Synonym Discussion of perturb
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