loosen someone's tongue

verb1

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To cause one to speak more freely; to cause one to discuss a subject that would not usually be discussed.
- We relapsed into silence. Presently he laughed. “There’s something in this starlight that loosens one’s tongue. I’m an ass, and yet somehow I would like to tell you.” — 1896

forms

loosened one's tongue · loosened someone's tongue · loosening one's tongue · loosening someone's tongue · loosens one's tongue · loosens someone's tongue