1. hot and cold: không kiên định, dao động

2. by and by: dần dần

3. first and last: hoàn toàn, từ đầu đến cuối

4. fits and starts: một cách khác thường, thất thường

5. over and over: mãi mãi

6. here and there: đây đó

7. again and again: liên tiếp nhiều lần

1. Of one's body, both hot and cold at once, as from shock or illness.

After the pneumonia took hold, she was hot and cold all night.

2. Alternating 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.

If someone or something makes you feel hot and cold, they make you feel extremely worried or nervous, and this causes you to feel as if your body is both hot and cold at the same time. 

When she realized what she was reading she grew hot and cold all over.