Johnny-on-the-spot

[ jon-ee-on-th uh-spot, -awn- ]

/ ˈdʒɒn i ɒn ðəˈspɒt, -ɔn- /

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

Henri missed these remarks, for he was Johnny-on-the-spot to retrieve the game.

Our Young Aeroplane Scouts in Germany |Horace Porter
Of course, I was Johnny-on-the-spot and would have saved the dear lady from such a terrible fate.

Mary Louise and Josie O'Gorman |Emma Speed Sampson
"Allus glad to be Johnny-on-the-spot," smiled the older man.

The Chalice Of Courage |Cyrus Townsend Brady
I'll be Johnny-on-the-spot all right, and have it ready for you.

Tom Swift and his Wizard Camera |Victor Appleton

When they want it, every one of these memoranda must be Johnny-on-the-spot before they can dig up the mazuma.

Bucky O'Connor |William MacLeod Raine

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]