Johnny-on-the-spot

[jon-ee-on-thuh-spot, -awn-]
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noun Informal.

a person who is on hand to perform a service, seize an opportunity, deal with an emergency, etc.

Origin of Johnny-on-the-spot

First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Idioms and Phrases with johnny-on-the-spot

Johnny-on-the-spot

A person who is available when needed, as in He always is there at the right time, a real Johnny-on-the-spot. [Late 1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.