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perturbation

n.
1.an unhappy and worried mental state
2.(physics) a secondary influence on a system that causes it to deviate slightly
3.activity that is an intrusion or interruption
4.a disposition that is confused or nervous and upset
5.the act of causing disorder

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    Idiom of the Day

    get dressed up
    to put on one's best clothes
    I like to get dressed up when I go to a nice restaurant.



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