big friend

noun

A natural number which when added to another number equals 10.

“The big friend of 3 is 7 because 3 + 7 = 10.”

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Meanings

nounbig friend (plural big friends)

plural big friends

  1. abacus jargoneducationA natural number which when added to another number equals 10.

    The big friend of 3 is 7 because 3 + 7 = 10.

    1 more example

    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.

    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 17 May 2023
  2. Used other than figuratively or idiomatically: see big, friend.
Cite this entry
APA

big friend. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/big%20friend

MLA

“big friend.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/big%20friend. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “big friend,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/big%20friend.

Source: big friend on Wiktionary, CC BY-SA 4.0.