Not all dictionaries are as strong on the first, so it might, at least, be more widely recognised than your dictionary suggests:
Wiktionary says it's BrE.
Merriam-Webster says it's mostly British.
Encarta says nothing.
The American Heritage Dictionary says nothing.
The Cambridge Dictionary of Idioms says it's mostly British and Australian.
Let's see what AmE speakers say about it.
Student or Learner