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sweet on (one)
Smitten with or enamored of someone. I think Samantha's getting a little sweet on her older sister's boyfriend. What about you, Tommy—anyone in school you're sweet on?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*sweet on someone
Rur. fond of someone. (Typically: be ~; become ~.) Tom is sweet on Mary. He may ask her to marry him. Mary's sweet on him, too.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Enamored of; in love with.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.