别说 (bié shuō): Not to mention / let alone (Conjunction) — Meaning & Stroke Order

Don't talk about this anymore, let's go.

Not to mention whether he is competent, don't you even doubt the feasibility of this project?

Not to mention obtaining additional support, we haven't even fully utilized the existing resources.

Not to mention him, even I find this task difficult.

Let alone completing this monumental work independently, even participating in the collaboration requires extremely high professional competence.