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perturb

American  
[per-turb] / pərˈtɜrb /

verb (used with object)

  1. to disturb or disquiet greatly in mind; agitate.

    I can see how such a massive change in your routine would perturb you.

    Synonyms:
    worry, trouble
    Antonyms:
    pacify
  2. to throw into great disorder.

    Huge construction projects can take years to finish, and meanwhile, can greatly perturb the neighborhood.

    Synonyms:
    muddle, disarrange, confuse
  3. Astronomy. to cause perturbation in the orbit of (a celestial body).


perturb British  
/ pəˈtɜːb /

verb

  1. to disturb the composure of; trouble

  2. to throw into disorder

  3. physics astronomy to cause (a planet, electron, etc) to undergo a perturbation

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of perturb

First recorded in 1325–75; Middle English perturben (from Old French perturber ), from Latin perturbāre “to throw into confusion,” from per- per- + turbāre “to agitate, confuse” ( see turbid)

Explanation

To perturb is to bug or bother someone by confusing them or throwing them off balance. You can try, but it's almost impossible to perturb the guards outside Buckingham Palace. If you're having trouble getting used to the word perturb, you're in luck! It's similar in meaning to the verb "disturb." That's right, to perturb is to disturb, but in a way that suggests you're throwing it off its usual path or routine. The movie Born Free truly perturbed widespread views about animals—people suddenly started seeing them as individuals. If you stare at a person you don't know, it won't be long before you perturb them.

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Example Sentences

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Perturb, per-turb′, v.t. to disturb greatly: to agitate—also Per′turbate.—adj.

From Chambers's Twentieth Century Dictionary (part 3 of 4: N-R) by Various