Definition of Johnny-on-the-spot in US English:

Johnny-on-the-spot

noun

North American
dated, informal
  • A person who is at hand whenever needed.

    • ‘‘And television networks that carry it and promote it and are Johnny-on-the-spot every time there's a terrorist act are promoting it,’ he said.’
    • ‘The FDA is not exactly known as a Johnny-on-the-spot agency.’
    • ‘Interior designers come to you not only to buy what you've got, but because of what you can put together… You have to be Johnny-on-the-spot.’
    • ‘Archuleta jarred the ball loose, and fellow S Kim Herring was Johnny-on-the-spot, picking up the loose ball and rambling to the endzone for a 10-0 lead.’

Pronunciation

Johnny-on-the-spot

/ˌjänēänT͟Həˈspät//ˌdʒɑniɑnðəˈspɑt/