1 British English
to be confused:
I'm in such a muddle, I'd completely forgotten you were coming today.
be in a muddle/get into a muddle over/about
My grandmother tends to get into a muddle over names.
to be untidy or in a disorganized state:
Sorry about the mess - we're in a bit of a muddle at the moment.
All my files have got into a muddle somehow.
2 [countable usually singular, uncountable]
when there is confusion about something, and things are done wrong as a result:
Our accountant finally managed to sort out the muddle.
There was a bit of a muddle over our hotel reservations.