beck and call

• beckon call (eggcorn misspelling)

beck and call (uncountable)

1. Summons and control, in a position of servitude or as an attendant.

   At his beck and call, he had a small fleet of waiters and servants.

   • 1942 May-June, “Notes and News: L.N.E.R. Traffic Regulating Office”, in Railway Magazine, page 187:

     The Traffic Regulating Officer thus has at his beck and call the assistance which he requires in deciding the extent to which restrictions on the acceptance and despatch of traffic are necessary.

• Almost always found as a prepositional phrasing "at one's beck and call"

• under one's thumb
• wrap around one's little finger

• “at someone’s beck and call”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.