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defocus

[dee-foh-kuh s]
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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).
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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.
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noun, plural de·fo·cus·es.
  1. the result of defocusing, as a blurred photographic image.
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Origin of defocus

First recorded in 1930–35; de- + focus
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018