Actually i was reading a passage of my reading comprehension book(entrance exam for MBA) and i am supposed give some answer of questions. This passage is big and this was the sentence that i did not understand. This passage was on biological research of Frog.
Horses 'rear'; they don't 'rare'. I had always thought this to be an American pronunciation of 'rear'.
You bring up an interesting point. How did the variant of "rear" end up the most common (at least in AmE) form in the expression? I have never heard "rearing to go", and I have had plenty experience with rearing horses..