big on (something)
Very interested or invested in something. My sister loves going to clubs because she's really big on dancing. My family is big on education, so I know I'm going to college next year. I like for a vacation to feel like a vacation, you know? No daily excursions for me—I'm big on lounging by the pool and getting massages and all that good stuff.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
big on
Enthusiastic about, as in Dad is big on Christmas with the whole family. [Slang; mid-1800s] 
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 big on
 Enthusiastic about; partial to: "a patriotic youth organization big on military-style marching drills" (Earl Swift).
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.