Definition of «dubious origin»

The phrase "dubious origin" means that the origin or source of something is unsure or questionable, making it doubtful or not fully trustworthy.

A dog food label listing simply «meat» is an example of a low - quality protein source of dubious origin. (whole-dog-journal.com)
«Write drunk, editor sober» is a famous quote with dubious origins. (booklighteditorial.com)
Will he bet his company's fortunes on these files of dubious origin? (cultofmac.com)
(see all sentences)