以至
yǐ​zhì

to such an extent that

yǐ​zhì to such an extent that · even to the point of
  1. 以 yǐ prepositionconjunction
    in order to
    in order to; so as to; used to connect two phrases where the second is the purpose of the first
  2. 至 zhì conjunctionadverb
    to arrive
    (bound form) to arrive; to reach

yǐ​zhì down to
  1. 以 yǐ preposition
    [positional boundary]
    (bound form) used before words of location or time to indicate a boundary, such as 以后 yǐ​hòu or 以上 yǐ​shàng
  2. 至 zhì preposition
    to
    to; until; used in written Chinese to connect two points in time, space, or quantity