on tap

on tap idiom
Available for immediate use, ready, as in We have two more trumpeters on tap for the parade. This metaphoric expression alludes to a beverage such as beer that is ready to be drawn from a cask. [Mid-1800s]

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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