verb (used with object), defocused, defocusing or (especially British) defocussed, defocussing.
to cause loss of focus of: The slightest movement will defocus the microscope.
to interrupt or disturb (concentration, attention, etc.).
to disturb the concentration or awareness of (someone).
verb (used without object), defocused, defocusing or (especially British) defocussed, defocussing.
to lose or go out of focus.
to lose concentration or awareness; become distracted.
noun, plural defocuses.
the result of defocusing, as a blurred photographic image.

1930–35; de- + focus Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
For example, bulging of the mirror surface can defocus a laser beam.
It's a common trick to do with stars, where you intentionally defocus them a bit with you take a photo.
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