I. (ˈ)dē, də̇ˌ verb
Etymology: de- + focus (I)
transitive verb
: to cause (as a beam of radiation or a lens) to be out of focus
defocused his eye
a defocused image
intransitive verb
: to lose accuracy of focus : become defocused
II. " noun
: a result of defocusing ; especially : an image (as on motion-picture film) deliberately blurred for dramatic effect