Portrait mode feature (4)
I believe the answer is:
blur
(Other definitions for blur that I've seen before include "Make or become indistinct" , "Hazy or indistinct representation" , "Obfuscate" , "Indistinct impression" , "Indistinct mark" .)
I believe the answer is:
blur
(Other definitions for blur that I've seen before include "Make or become indistinct" , "Hazy or indistinct representation" , "Obfuscate" , "Indistinct impression" , "Indistinct mark" .)