"sue over" is a correct and commonly used phrase in written English.
This phrase means to take legal action over a certain matter. For example, "The company sued over copyright infringement."
Argent may sue over the issue.
Judge allows Starbucks customers to sue over underfilled lattes.
Some point to so-called patent trolls, companies that exist solely to sue over patent violations.
The result is that it now pays to sue over patents as a routine business practice.
Their lawyers are now threatening to sue over breach of contract.
There is a good chance that someone will sue over it.
Supporters said the state's decision to sue over Longmont's regulations stiffened their resolve.
State officials expect the unions to sue over the benefits cuts.
Celebrities and public figures are queuing up to sue over intrusions into their privacy.
Finding someone to sue over losses in the mortgage market and the credit crisis is easy.
The writer couldn't sue over that stereotype of his plots, but the insult is inaccurate.
