This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

v. Present participle of cliffhang.

adj. Suspenseful.

"Had the Parkers been cruising at another five hundred feet, he would have managed a bumpy but passable landing, reducing the incident to just another anecdote about the kind of cliffhanging hair's-breadth escape that came so frequently in the lives of top undercover agents like Richard and Mary Parker."

cliffhanger