
Be mad for somebody/something
Informal Use
Suitable for casual conversations and not for formal settings like business meetings.

She's mad for Broadway shows — already seen the same one five times!
Intensity
Expresses a very strong level of enthusiasm, going beyond just liking something.

I'm mad for vintage cars; I even fly to exhibitions.
Not Literal
It's a figurative expression and doesn't mean being angry or mentally unstable.

He's mad for chess, but he's the calmest person I know.
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