loosen

If you loosen something, you make it looser.

Example: Can you loosen the lid on this jar for me.

If somebody loosens up, they become more relaxed.

Example: She loosened up after she'd had a glass of wine.

If your joints or muscles loosen up, they start to move more easily.

Example: I took a deep breath, and I could feel the muscles in my chest loosen.

If you loosen somebody's tongue, you make them talk about something they would not talk about before.

Example: But what truly loosened my tongue was knowing I was on home ground.