at someone's service

at someone's service idiom
Ready to help someone, at someone's disposal, as in The tour guide said he was at our service for the rest of the afternoon. [Second half of 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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