The phrase "cross wire" is typically used in reference to a communication mishap where two parties misunderstand each other due to a miscommunication. Some common synonyms for "cross wire" includes "miscommunication," "misunderstanding," "mix-up," and "confusion." These words all suggest that the communication between two parties has gone awry, resulting in a confusion of information or intent. Other related expressions include "talking past each other," "not being on the same page," and "missing each other's messages." While these phrases may differ in tone and level of severity, they all describe a situation where communication has broken down and caused confusion.