According to the Urban Dictionary, they seem interchangeable.
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Interesting one. I've always known it as "raring to go" but on reflection "rearing" seemed correct. I checked in Chambers which gives "raring" as an adjective meaning, eager, full of enthusiasm, especially in the phrase "raring..." and relates it to the verb "rear"
ReplyDeleteI guess it's one of those old forms which survive in a single phrase outside of which they have no application.