Expression: "Yes, I'll hold"

[Estela]

English Language Tests, Intermediate level

ESL/EFL Test #724 "Real Life: Talking on a Business Phone (1)", question 3

Hi. Can I speak to Roberta Stafford please? .........

(a) Sure. Can I tell her who is calling?
(b) Sure. I'll tell her that you called when she gets in.
(c) Yes, I'll hold.

English Language Tests, Intermediate level

ESL/EFL Test #724 "Real Life: Talking on a Business Phone (1)", answer 3

Hi. Can I speak to Roberta Stafford please? Sure. Can I tell her who is calling?

Correct answer: (a) Sure. Can I tell her who is calling?
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sorry, but i can't understand what " Yes,I'll hold"mean.Could you help me please?

[Mister Micawber]

.
Hold = wait at one end of a telephone call until the called person comes to the phone at the other end.
.
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Native English teacher at Mister Micawber's