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

1.
confondre, embrouiller
to confuse two or more things or people
:
•
I always muddle up their names because they sound so similar.
Je confonds toujours leurs noms parce qu'ils se ressemblent tellement.
•
The instructions were so complicated that I muddled them up.
Les instructions étaient si compliquées que je les ai embrouillées.