Definition of infra dig adjective from the Oxford Advanced Learner's Dictionary

 

infra dig

 adjective
adjective
BrE BrE//ˌɪnfrə ˈdɪɡ//
 
; NAmE NAmE//ˌɪnfrə ˈdɪɡ//
 
[not before noun](old-fashioned, informal)
 
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considered to be below the standard of behaviour appropriate in a particular situation or to somebody’s social position She thinks catching the bus is a bit infra dig. Word Origin early 19th cent.: abbreviation of Latin infra dignitatem ‘beneath (one's) dignity’.
See the Oxford Advanced American Dictionary entry: infra dig