to say nothing of UK /tʊ seɪ ˈnʌθɪŋ əv/US /tə seɪ ˈnʌθɪŋ əv/ conjunction1 •An apophasis used to mention another important, usually related, point: not taking into account, not to mention, without considering.She had already eaten a large lunch, to say nothing of a full cooked breakfast that morning.
