bié​tí

don't mention

别提 別提 bié//tí
don't mention verb
Do not bring up or talk about a certain topic, often because it is unpleasant, painful, or annoying

Don't mention my name!

indescribably
Used for emphasis to suggest that a quality is so extreme it cannot be put into words; no need to mention.
let alone
Used to indicate that something is even more unlikely or impossible than what was just mentioned; not to mention

Frequency

Movie subtitles
17.7 per million appears in 9% of films
Written text
2.77 per million

Sources