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。