Blow hot and cold?

[Magomed]

Test No. incompl/inter-18 "Hot and Cold", question 2

You can never tell exactly what she is thinking because she very often ......... hot and cold over some topics.

(a) blows
(b) swings
(c) flies
(d) changes

Test No. incompl/inter-18 "Hot and Cold", answer 2

You can never tell exactly what she is thinking because she very often blows hot and cold over some topics.

Correct answer: (a) blows

Your answer was: correct
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What does it mean?
blows hot and cold
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What does it mean blows hot and cold

[Alan]

Hi,

This means she keeps changing her moods.

Alan
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English as a Second Language
You can read my ESL story Phrasal Verbs/look

[Petchnamnung]

Why we can not use other words? Is it idiom?

[Goodmahsa]

sure it is an idiom