Definition
to give someone your full attention until they have completely expressed themselves
听完（某人）说话
Before making a decision, make sure to hear her out.
在做决定之前，务必听她把话说完。
He is very grateful that you were willing to hear him out.
他非常感激你愿意听他把话说完。
Even if you disagree with his views, you should still hear him out first.
即使你不同意他的观点，你还是应该先听他说完。