at beck and call
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at someone's beck and call
ready to obey someone. What makes you think I wait around here at your beck and call? I have to leave for work, you know! It was a fine hotel. There were dozens of maids and waiters at our beck and call.
at somebody's beck and call
ready to do whatever someone asks Imagine what it's like to have a cook and a maid at your beck and call.
at (someone's) beck and call
Ready to comply with any wish or command.