American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

On the job training


Apprenticeship. Learning a  new skill by performing it at work. Some employees are tossed into a new job they’ve never done before and they must learn the tricks of the trade as they go along.  (Compare to Trial and error.)

“President Trump was never prepared to be President of the United States, it was on the job training for him.”

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