1) In poker, it is the minimum amount you can buy in terms of poker chips. It is the opposite of cash out

2) buying in can be similar to selling out the difference is semantics. Buying can apply to a line of thought or an ideal or whatnot.
1) "The buy in at the hold em table is $50."

2) "After moving to the USA, we bought in to the american lifestyle and values."
by dracula June 26, 2004
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