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be hot and cold

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be hot and cold

1. To feel that one's body is both hot and cold at once, as from shock or illness. After the pneumonia took hold, she was hot and cold all night.

2. To alternate between two opposite states, especially being enthusiastic or interested one moment and disinterested the next. He was hot and cold throughout our entire date, so I have no idea if he wants to see me again.

See also: and, cold, hot