"Dust-up" is a phrase that is used to describe a physical altercation or a heated argument. There are several synonyms for this phrase that are commonly used in English language. One of the most common synonyms is "scuffle", which refers to a brief and disorderly fight or quarrel. Another synonym is "tussle", which is similar to a scuffle, but it mainly involves a struggle or a contest between two people. "Altercation" is also a great synonym for "dust-up", as it is used to describe a heated argument or a dispute. Other synonyms for "dust-up" include "brawl", "melee", and "squabble".