惟命是从
wéi​mìng​shì​cóng

to be at someone's bidding

  1. 惟 wéi
    [particle]
    (literary) Used at the start or middle of a sentence to balance rhythm or adjust tone, without having a specific meaning; equivalent to 唯 wéi or 维 wéi in this role.
  2. 命 mìng nounverb
    order
    an instruction or command given by a superior
  3. 是 shì
    [object marker]
    (literary) a particle used to pull the object of a sentence to the front for emphasis
  4. 从 從 cóng verb
    to comply with
    To obey; to follow a principle, rule, or custom; to listen to