Mix up and Miss by a mile

Mix up verb - To fail to differentiate (a thing) from something similar or related.

Miss by a mile and mix up are semantically related In some cases you can use "Miss by a mile" instead a verb "Mix up".

Mix up and miss by a mile are semantically related in make a mistake topic. Sometimes you can use "Mix up" instead a verb phrase "Miss by a mile", if it concerns topics such as miscalculate.