About
HSK levels

    xiāo

    1. to diminish; to subside; to consume; to reduce
    2. to idle away (the time)
    3. (after 不[bu4] or 只[zhi3] or 何[he2] etc) to need; to require; to take

    这个肿胀过几天就会消下去。 Zhège zhǒngzhàng guò jǐ tiān jiù huì xiāo xiàqù.