en_tn_lite_do_not_use/psa/140/009.md

raise their heads

This is a sign of being arrogant. Alternate translation: "are arrogant" (See: rc://en/ta/man/translate/translate-symaction)

let the mischief of their own lips cover them

This is a prayer that God would make the evildoers suffer from the trouble that they caused by the things they said.

the mischief of their own lips

The trouble that they themselves caused by what they said. (See: rc://en/ta/man/translate/figs-metaphor)

cover them

That is, stop them from causing any more trouble. (See: rc://en/ta/man/translate/figs-metaphor)