Inside baseball is a term popular with political and media analysts.
It describes technical matters only of interest to specialists or enthusiast rather than the casual observer.
Baseball references are commonplace American English and have increasingly been taken up by the British media. A politician hits a home run or strikes out (while Californian criminals famously have three strikes or convictions before they get a mandatory life sentence). He/She should also be wary of curve balls or attacks from unexpected directions.
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Where does the word baseball come from?
What is a curved ball?
The Language of Baseball: A Complete Dictionary of The Grand Ole Game