don't even think about it

Phrase

Don't do it, under any circumstances!

Japanese Meaning

どんな状況下でも絶対にそれを実行してはいけない / その行動を決して試みてはいけない / 絶対に関わるべきでない

If you were planning to borrow my car without asking, don't even think about it.

もし無断で私の車を借りようとしているのなら、絶対にしてはいけません。

Sense（1）

Don't do it, under any circumstances!

don't even think about it!

（ canonical ）