About
HSK levels

    底线 底線

    dǐxiàn

    1. bottom line; the limit of what one is prepared to accept
    2. (sports) baseline
    3. (sewing) under thread
    4. spy; informer; plant

    这是我的底线,我不能再退步了。 Zhè shì wǒ de dǐxiàn, wǒ búnéng zài tuìbù le.