Definition of "loosen up" [loosen up]

• To become loose; to loosen (verb)
• To relax, act less seriously. (verb)

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• "I think they do it to loosen up their witnesses, the same way you get a person to talk about him-or herself at a cocktail party."
• "SIZE UP AND STRETCH Keep in mind that denim even without a touch of stretch or Lycra in the fabric will loosen up and stretch out over time."
• "He looked at me for a moment, perhaps hoping I would loosen up and hand him a fistful of Krugerands, but as I said, that cruller was weighing heavily on my mind and I did not relent."