1. to become loose; to slacken (e.g. rope)

2. to become less tense; to relax; to let one's guard down

3. to slacken (e.g. coldness, supervision); to become lax

4. to become softer (e.g. ground, facial expression); (of ice) to partially melt

5. to decrease (e.g. speed)

6. (of a market price) to go down slightly