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John·ny-on-the-spot | \ ˈjä-nē-ˌȯn-t͟hə-ˈspät 
, -ˌän- \
, -ˌän- \Definition of Johnny-on-the-spot
: a person who is on hand and ready to perform a service or respond to an emergency
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Time Traveler for Johnny-on-the-spot
The first known use of Johnny-on-the-spot was in 1880
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