Definition
to give someone your full attention until they have completely expressed themselves
聽完（某人）說話
Before making a decision, make sure to hear her out.
在做決定之前，務必聽她把話說完。
He is very grateful that you were willing to hear him out.
他非常感激你願意聽他把話說完。
Even if you disagree with his views, you should still hear him out first.
即使你不同意他的觀點，你還是應該先聽他說完。