Definition of blanket adjective from the Oxford Advanced Learner's Dictionary

 

blanket

 adjective
adjective
BrE BrE//ˈblæŋkɪt//
 
; NAmE NAmE//ˈblæŋkɪt//
 
 
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[only before noun] including or affecting all possible cases, situations or people a blanket ban on tobacco advertising a blanket refusal What I object to most is the blanket opposition to change. Word Origin Middle English (denoting undyed woollen cloth): via Old Northern French from Old French blanc ‘white’, ultimately of Germanic origin.
See the Oxford Advanced American Dictionary entry: blanket