let alone

let aloneconjunction

UK/ˌlet əˈləʊn/US/ˌlet əˈloʊn/

C1used to say that one thing is not true or possible, so another thing is even less possible
- I can't afford a bike, let alone a car.

let alone — nghĩa, phát âm và ví dụ | Từ điển Anh – Anh · Study Today