Wiktionary
conj. (context idiomatic English) Used by the speaker to mention another important point; an apophasis.
WordNet
adv. much less; "she can't boil potatoes, let alone cook a meal" [syn: let alone]
Usage examples of "not to mention".
Besides, every Bronze Barbarian knew that the prince was sudden death on two feet with the bead pistol holstered at his side, not to mention the sword across his back.
By the time I got to Vinnie's I was nice and toasty and could see my entire hood, not to mention the road.
After all, she'd been a thorn in his side- not to mention other parts of his anatomy-all morning.
Since it wasn't like him not to mention others, I guessed that he figured most of the searching and….
That, too, upset Herodotus (II, 46): 'But that is how they paint him, why, I should prefer not to mention.
You would ruin some man's life while spoiling hers, not to mention the damage to possible children.
With what joy we had held up banks, relished the excitement-not to mention the money.
I enjoy a good meal and have always considered her a great cook, but she wore too much pink and too many ruffles - not to mention those eyeglasses with rhinestone-studded frames.
I had lost my grip on the conversation, not to mention the whole situation.