english
1
general::
Phrase(s): to say nothing of someone or something not to even mention the importance of someone or something. • John and Mary had to be taken care of, to say nothing of Bill, who would require even more attention. • I’m having enough difficulty painting the house, to say nothing of the garage that is very much in need of paint.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
see under NOT TO MENTION.
American Heritage Idioms