"Lips" represents what a person says. AT: "in what a sensible person says" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# a rod is for the back
"Rod" represents strong, physical punishment and "the back" represents the person who receives the punishment. AT: "a person who has no sense needs forceful punishment" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-synecdoche]])