California, United States of America
The following excerpt is from Gehron v. Nicholas, E061855 (Cal. App. 2016):
1. By failing to address the trial court's dismissal of their claims against defendants for unfair business practices, fraudulent concealment, breach of the covenant of good faith and fair dealing, and money had and received, plaintiffs waived any claim of error regarding those claims on appeal. (Dieckmeyer v. Redevelopment Agency of Huntington Beach (2005) 127 Cal.App.4th 248, 260 ["An appellant's failure to raise an argument in its opening brief waives the issue on appeal"].)
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