labour the point idiom
反复强调，不厌其烦地表明，三番五次地说明
to try too hard to express an idea, feeling, or opinion, repeating it when this is not necessary
Look, there's no need to labour the point - I made a mistake - I admit it! 喂，用不着三番五次地说来说去——我犯了错误——我承认！