at someone's beck and call
US /æt ˈsʌm.wʌnz bɛk ænd kɔl/
UK /æt ˈsʌm.wʌnz bɛk ænd kɔl/

1.
siap sedia, selalu siap melayani
always available to do whatever someone asks
:
•
She expects her assistants to be at her beck and call 24/7.
Dia mengharapkan asistennya selalu siap sedia 24/7.
•
I can't always be at your beck and call; I have my own life.
Aku tidak bisa selalu siap sedia untukmu; aku punya hidupku sendiri.