JULY 24, 2008 | No worries, Don't worry (about it)
Let's pretend you're paying for something in a store, and you're 10 cents short ( = you need 10 more cents). The cashier might tell you "Don't worry about it", which would mean "It's alright", "It's no problem", etc. This might sound strange, but in this case it's more natural to say "don't worry about it" than to say "don't worry", which would have the connotation of "stop worrying". The cashier is not telling you to "stop worrying" - he/she is telling you that "it's alright" that you're 10 cents short :) What's even more funny (and sometimes confusing) is that "don't worry about it" (no problem) sometimes has a different feel from "don't worry about that" (stop worrying about that)!
"No worries" is a colloquial way of saying "no problem", "it's alright". Again, it should not be used to say "stop worrying".
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