A sort of adjective/participle/verb phrase. To be "big on" something is to like it, be a fan of it, etc.
If you're a propenent of something, you're also big on it.
1) "I'm big on history. I really like learning about ancient people and how what they did affects us today."
2) "That congresswoman is really big on spending for schools and education."
Prices shown in USD.
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