Quick definitions from WordNet (sound out)
▸ verb: try to learn someone's opinions and intentions ("I have to sound out the new professor")
▸ verb: speak, pronounce, or utter in a certain way ("Can the child sound out this complicated word?")
▸ verb: try to learn someone's opinions and intentions ("I have to sound out the new professor")
▸ verb: speak, pronounce, or utter in a certain way ("Can the child sound out this complicated word?")