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二一添作五

èryītiānzuòwǔ ㄦˋ ㄧ ㄊㄧㄢ ㄗㄨㄛˋ ㄨˇ

    • lit. one half equals zero point five (division rule in abacus reckoning)
    • to share fairly between two parties
    • to go fifty-fifty

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
two-one, add to make five
Meaning
An abacus rule for dividing by two. It means splitting something equally, including sharing costs, duties and blame evenly.

Sources