Johnny-on-the-spot


Also found in: Idioms.

John·ny-on-the-spot

 (jŏn′ē-ŏn′thə-spŏt′, -ôn′-)
n. Informal
A person who is available and ready to act when needed.

John′ny-on-the-spot′



n., pl. Johnnies-on-the-spot.
a person who is on hand to perform a service or seize an opportunity.
[1860–65]