have a case on (someone)

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have a case on (someone)

To have a romantic infatuation with someone, especially unbeknownst to that person. I've had a case on Tommy for years.
See also: case, have, on

have a case on

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.
See also: case, have, on