打通

On the HSK 7-9 vocabulary list, at CEFR level C2.

tōng ㄉㄚˇ ㄊㄨㄥ

    • to open access
    • to establish contact
    • to remove a block
    • to put through (a phone connection)

Character by character

Other words read tōng

datong with other tones

Sources