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Johnny-on-the-spot

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Johnny-on-the-spot

  (American informal)

someone who is immediately ready to do something, especially to help someone This guy had just gotten a flat tire, and there I was, Johnny-on-the-spot with my tools in the back of the car.

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]