muddle up

Verb

 * 1)  to confuse (one or more objects with another object or other objects)
 * Whenever I meet the twins, I always muddle up their names. I call John Jim, and Jim John.
 * 1)  To mix together
 * muddle up the letters in the word, and try to make new ones.

Translations

 * Bulgarian:
 * Italian: fare confusione