Definition of off adjective from the Oxford Advanced American Dictionary

 

off

 adjective
adjective
NAmE//ɔf//
 
, NAmE//ɑf//
 
 
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used to describe someone performing or feeling worse than usual Her tennis game was really off last night. off day/week I was having an off day and couldn’t get anything done.
See the Oxford Advanced Learner's Dictionary entry: off