Sentence:  Then Hrefna said she would coif herself with it, and Thurid said she had better, and Hrefna did so. When Kalf saw that he gave her to understand that she had done <WSD>amiss</WSD>; and bade her take it off at her swiftest. "For that is the one thing that we, Kjartan and I, do not own in common." 
Meaning of the word marked with <WSD> tags:  Wrongly.