en_tn_condensed/pro/18/07.md

A fool's mouth ... with his lips

Both of these phrases refer to what a fool says. AT: "What a fool says ... by what he says" (See: rc://en/ta/man/translate/figs-metonymy)

is his ruin

"will ruin him"

he ensnares himself

This speaks of the man causing problems and trouble for himself as if he were trapping himself like a man traps an animal. AT: "he will cause problems for himself" (See: rc://en/ta/man/translate/figs-metaphor)