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defocus

[ dee-foh-kuhs ]

verb (used with object)

, de·fo·cused, de·fo·cus·ing or (especially British) de·fo·cussed, de·fo·cus·sing.
  1. to cause loss of focus of:

    The slightest movement will defocus the microscope.

  2. to interrupt or disturb (concentration, attention, etc.).
  3. to disturb the concentration or awareness of (someone).


verb (used without object)

, de·fo·cused, de·fo·cus·ing or (especially British) de·fo·cussed, de·fo·cus·sing.
  1. to lose or go out of focus.
  2. to lose concentration or awareness; become distracted.

noun

, plural de·fo·cus·es.
  1. the result of defocusing, as a blurred photographic image.
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Word History and Origins

Origin of defocus1

First recorded in 1930–35; de- + focus

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