ㄏㄨㄐㄧˊㄌㄞˊhūzhījíláiㄏㄨㄟㄐㄧˊㄑㄩˋhuīzhījíqù

呼之即来,挥之即去
  1. 揮手比喻任意使喚 不是奴才甚麼可以呼之即來,揮之即去」。

to come when called (idiom)​; ready and compliant, always at sb's beck and call