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general::
Phrase(s): not worth the paper it’s written on [and] not worth the paper it’s printed on
Fig. [of a document] meaningless or without authority; of no value. • That contract isn’t worth the paper it’s written on. All the signatures are forged. • Don’t take a check from that guy. It’s not worth the paper it’s written on.
McGrawhill's American Idioms And Phrasal Verbs