in waiting

in waiting idiom
In attendance, especially on a royal personage. For example, The prelates who were in waiting asked him to take the last rites. This usage has become less common with the diminution of royalty and royal courts but still survives. [Late 1600s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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