This is a rhetorical question that Nehemiah is using to scold the nobles. It can be translated as a statement. Alternate translation: "You should walk in the fear of our God to prevent the taunts of the nations that are our enemies." (See: [[rc://en/ta/man/translate/figs-rquestion]])
This is and idiom. Here "walk" refers to a person's behavior and the way he lives. Alternate translation: "live your life in a way that honors God" (See: [[rc://en/ta/man/translate/figs-idiom]])
The word "taunt" means "slander" or "mockery" and it can be expressed as a verb. Alternate translation: "the nations who are our enemies from taunting us" or "the enemy nations from mocking us" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])