随时待命

隨時待命
suíshídàimìng
  1. on call
  2. always available
  3. ready at all times

CEDICT

Entry Composition

1 随时 suíshí
  1. at any time; at all times
  2. at the right time; whenever necessary
2 待命 dàimìng
  1. to be on call
  2. to be on standby