Chill (verb)

1. Make or become cold.
2. Make or become less warm.
3. Make or become less enthusiastic or friendly.

Origin:

Middle english: from old english cȳlan "cool, make cool", of germanic origin.

Examples:

1. The ice cream will chill in the freezer.
2. The air chilled as the sun went down.
3. The room chilled as the fire went out.
4. The atmosphere chilled as the conversation turned serious.
5. The relationship chilled after the argument.