muddle up
US /ˈmʌd.əl ʌp/
UK /ˈmʌd.əl ʌp/

1.
confundir, misturar
to confuse two or more things or people
:
•
I always muddle up their names because they sound so similar.
Eu sempre confundo os nomes deles porque soam muito parecidos.
•
The instructions were so complicated that I muddled them up.
As instruções eram tão complicadas que eu as confundi.