[put] {sb} on hold

to temporarily make someone wait during a phone call before resuming the conversation

When the customer called the support hotline, the representative put them on hold to check for information.
I had to put my friend on hold for a moment to answer another call.
The automated voice said, "Please hold," before putting the caller on hold for a few minutes.
The receptionist put the caller on hold while they looked for the requested document.
She apologized and put the client on hold to verify the order details.