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    先走一步

    xiānzǒuyībù

    1. to leave first (courteous expression used to excuse oneself)
    2. (euphemism) to predecease; to die first (e.g. before one's spouse)

    我先走一步,有事要处理。 Wǒ xiānzǒu yībù, yǒushì yào chǔlǐ.