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English
Noun
big friend (plural big friends)
- (education, abacus jargon) A natural number which when added to another number equals 10.
The big friend of 3 is 7 because 3 + 7 = 10.
2023 May 17, u/silly_rabbit289, “Shakuntala Devi The Indian who was known as a human computer for her mental math skills.”, in Reddit, r/nextfuckinglevel, archived from the original on 2023-05-17:I tried learning abacus but left it cause it was too boring for me. All I learnt was 7 is the big friend of 3 lol.
- Used other than figuratively or idiomatically: see big, friend.
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