RobH_en_tn/psa/010/007.md

His mouth is full of curses and lies and oppression

What people say is spoken of as being in their mouth. Alternate translation: "He always curses people, tells lies, and threatens to harm people" (See: rc://en/ta/man/translate/figs-metonymy)

under his tongue are mischief and evil

Here the tongue represents speaking. Alternate translation: or "what he says injures and destroys people" or "he speaks words that threaten and hurt people" (See: rc://en/ta/man/translate/figs-metonymy)