be sweet on

be sweet on

To be smitten with or enamored of someone. I think Samantha is a little sweet on her older sister's boyfriend. What about you, Tommy—anyone in school you're sweet on?
See also: on, sweet
Farlex Dictionary of Idioms.

sweet on, be

Enamored of, in love with, as in I think Barbara's sweet on Nick. This colloquial idiom was first recorded in 1740.
See also: sweet
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • sweet on, be
  • sweet on
  • sweet on (one)
  • enamor
  • enamored of
  • enamored of (someone or something)
  • infatuated
  • be infatuated with (someone or something)
  • taken with
  • be taken with (someone or something)