This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Having sweptback wings. Used of an aircraft.

n. A sweptback wing.

adj. (of an aircraft) having sweptback wings

"He couldn't afford to get those sweptwing escorts mixed up with any Soviet-built types who might have wandered into the sky he was covering."

swept   

sweating