Is There a Difference Between British and American English?

Even between british and american english er, we the idioms do cause confusion. So instead of saying, i'll take a rein check on that, i should say, in an international group,. That's just simpler. In an international group, it's easier understand. Or maybe i check, do you know this expression, have you ever heard this? And then i chek,Do you know what it means to be on the case? Yes, that's right. The guy will probably say, no. And then i can explain it if i want. E sometis a part of this traveler doctor thing is tryin to take to to, let's say, train