en_tn_lite_do_not_use/pro/14/03.md

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the mouth of ... the lips of

The mouth and the lips both refer to what a person says. (See: rc://en/ta/man/translate/figs-metonymy)

a rod for his back

The rod with which people will punish the fool by hitting him on his back for his foolish words is a metonym for the words that come out of his mouth. Alternate translation: "words that will cause people to punish him" (See: rc://en/ta/man/translate/figs-metonymy)

the wise

This word is plural. "wise men" or "wise people"

will preserve them

"will keep them from harm" or "will keep them safe"