Opening the lips represents speaking, and opening them wide represents speaking too often or too much. AT: "speaks a lot" or "talks too much" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "appetite" represents desire. AT: "diligent people will have a richly satisfied life" or "being diligent will make people richly satisfied" (See: [[rc://en/ta/man/translate/figs-activepassive]])