let alone

Idioms  

1. See leave someone alone .

2. Not to mention, as in We have no room for another house guest, let alone an entire family . [c. 1800]

---

Example Sentences

The Met Office said the heat would be "exceptional in the UK even in mid-summer, let alone in May".

From BBC • May 25, 2026

Similarly, his cultural allusions no longer provoke even a tingle, let alone a shock of recognition.

From The Wall Street Journal • May 22, 2026

Geisbert pointed out that the vaccine was only tested on mice -- and these results often do not translate to monkeys, let alone humans.

From Barron's • May 19, 2026

For decades, elected officials have not had to focus on the film and TV business, let alone turn it into a campaign issue.

From Los Angeles Times • May 17, 2026

“We don’t even know where we are, let alone why. It’s worse than rolling downhill in the dark.”

From "The Book of Three" by Lloyd Alexander