This year I will sit the FCE, a British English exam. I don't know if I should use word meanings that aren't in British vocabulary but are common in other countries.
For instance, the word "grouse". In informal Australian English, it's a synonym for "good, excellent", which is great. However, in the Cambridge Dictionary (British English), it means "to complain" or "a fat bird that is hunted or its meat".
What do you think? Thanks.