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hear (one) out
To listen to the entirety of what someone has to say, often when the listener is reluctant to do so. I know you don't want to change our plans, but hear me out—if we go to the beach on Saturday instead of Friday, we can probably avoid this storm.
hear someone out
1. Lit. to hear all of what someone has to say. (Fixed order.) Please hear me out. I have more to say. Hear out the witness. Don't jump to conclusions.
2. Fig. to hear someone's side of the story. (Fixed order.) Let him talk! Hear him out! Listen to his side! We have to hear everyone out in this matter.
Listen to someone's discourse until the end, allow someone to speak fully, as in Please hear me out before you jump to any conclusions. [First half of 1600s]
To listen to someone without interrupting: Hear me out, I have something important to say. I heard the mediator out, but I didn't agree.