mention] or [not to speak of] or [to say nothing of]Without ever needing to
speak of; in addition to; besides. - Used toadd something to what you have said
Dave is handsomeand smart not to mention being a good athlete.
They have threefine sons, not to speak of their two lovely daughters.
Sally takessinging and dancing lessons to say nothing of swimming and
Compare: LET ALONE, TO SPEAK OF.