let alone～

否定文の後で用いられ、「～は言うまでもなく」「～などとんでもない」

Ex

• I didn’t have enough money to buy a used car, let alone a new one.
• Accidents rarely occur in this part of town, let alone at the intersection.

Reference source

• https://reibunpo.com/let/let-alone.shtml#:~:text=「let%20alone%20～」はふつう,く、フランス語も話せない。