v. phr. To change your ways or likes often; be fickle or changeable. Tom blows hot and cold about coming out for the baseball team; he cannot decide. Mary blew hot and cold about going to college; every day she changed her mind. The boys will get tired of Ann's blowing hot and cold.
BLOW HOT AND COLD
Meaning of BLOW HOT AND COLD in English
American idioms English vocabulary. Английский словарь американских идиом. 2012