What is another word for is supine?
Pronunciation: [ɪz sˈuːpa͡ɪn] (IPA) 
The phrase "is supine" can be used to describe a person lying flat on their back. However, there are many synonyms that can be used to convey this same position. Some other descriptive words might include "prone", "prostrate", "recumbent", and "horizontal". Each of these has slightly different connotations, but they all point to the same basic body position. Additionally, these terms can be used to describe objects or animals as well as people. So whether you're talking about a person stretched out on a blanket or a cat lounging on a windowsill, there are plenty of ways to describe the supine position in a variety of situations.
