To hear out is to listen to somebody until they have finished. Hear him out first.
It is nearly always a request, since the person asking expects to be interrupted. To hear out somebody you disagree with is harder and more useful than answering at once.
1phrasehear outTo listen to somebody until they have finished.
“At least hear out the argument before deciding.”
hear out is a phrase.
Practised in A Song of Ice and Fire