defocus
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de·fo·cus
(dē-fō′kəs)tr.v. de·fo·cused, de·fo·cus·ing, de·fo·cus·es or de·fo·cussed or de·fo·cus·sing or de·fo·cus·ses
To cause (a beam or a lens) to deviate from accurate focus.
n.
The act or result of causing a lens to deviate from accurate focus.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
defocus
(diːˈfəʊkəs)vb
formal to go or cause to go out of focus
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014