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perturb


perturb
Pronunciation: ⁄pəˈtəːb⁄
verb
[with object]
·              1make (someone) anxious or unsettled:
they were perturbed by her capricious behaviour
[with object and clause]:he was perturbed that his bleeper wouldn’t work

·              2subject (a system, moving object, or process) to an influence tending to alter its normal or regular state or path:
nuclear weapons could be used to perturb the orbit of an asteroid
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