2020 election: What is a 'cured' ballot?

What is a “cured” ballot? These are ballots in which a problem such as a missing or mismatched signature has been fixed by the voter so they can still count.

Trump campaign announces federal lawsuit in Nevada

The Trump campaign is filing a federal lawsuit in Las Vegas Thursday, claiming there are voter irregularities. They said they have evidence that people who are deceased and non-residents have cast ballots in the 2020 election.