lips嘴唇；cool凉的冷静的、镇静的、平静的，cool your lips就是让你的嘴冷静一下，冷静下来。

【例句】
Martin’s mum cools her lips when she is about to give him a lecture on his crazy shopping. Instead, she chooses to listen to his explanation first。
马丁的母亲知悉他疯狂购物时本想大骂他一顿，但最终选择冷静下来, 先听听他的解释。

You cool your lips, and then listen to me in detail.
你先冷静下来，然后听我详细说。