have a case on

Idioms  

1. Also, have a crush on. Be infatuated with someone, as in He's had a case on her for years, or Teenage girls often have a crush on this teacher. The first slangy term dates from the mid-1800s; the second, a colloquialism, dates from the late 1800s.

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Example Sentences

"I'm using the Brenda case as a precedent. Now I have a case on which I can challenge the president," she says.

From BBC

If you don’t have a case on the tablet, don’t be surprised if the pen gets knocked off in your bag.

From The Verge

Unlike before, you don’t have to be worried if you have a case on your phone, either.

From The Verge

I didn’t test it with a bulky case, although I do have a case on my phone.

From The Verge

“Right now, I don’t have a case on it, and it slips everywhere. If it’s in my pocket, it slips out to the couch.”

From Los Angeles Times