To pass away without effect; to cease, or be dissipated

To become calm.

1. To become cool.
2. To become calm.

1. To feel less enamoured of something or somebody.
2. When the temperature of a thing or place becomes lower, it cools off.
3. When you become less angry or less excited, you cool off.

To become progressively weaker.

When people settle down, they start to live a less active life and perhaps get married, buy a house, and start a family.

1. To become calm or peaceful
2. To become reduced by or as if by simmering

1. To draw gradually toward an end
2. Relax, unwind
3. To cause a gradual lessening of usually with the intention of bringing to an end