can't make head nor tail of something

idiomPart oftail

can't make head nor tail of something — idiom

1. to be completely unable to understand something, such as a confusing explanation

1.idiom
Definition

to be completely unable to understand something, such as a confusing explanation or a badly written message

Example

Sade stared at the map for ten minutes but could not make head nor tail of the directions.

The instructions were so poorly translated that Layla could not make head nor tail of them.