以至于
yǐ​zhì​yú HSK7

so much so that

yǐ​zhì​yú so much so that
  1. 以至 yǐ​zhì conjunction
    to such an extent that
    Used at the start of a clause to express a result or degree caused by a previous situation; so that
  2. 于 於 yú verbpreposition
    towards
    Indicates a direction, goal, or result

yǐ​zhì​yú up to
  1. 以至 yǐ​zhì
    down to
    used to connect words or phrases to indicate an extension in time, quantity, or range; up to
  2. 于 於 yú verbpreposition
    towards
    Indicates a direction, goal, or result