Third-person singular simple present indicative form of backfire.(verb)
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Use "backfires" in a sentence
"And we know that is the clever phrase backfires, as did the inventive historian's characterization of Rep. Paul Ryan's R-WI budget plan as "right wing social engineering," he will invent a tale to rewrite history."
"Giving Adam the pimp slot kind of backfires on you when your show runs over and everyone's DVR / TIVOs cut off his performance!"
"Just from watching TV, I know that professional firefighters employ "backfires" to control wilderness (forest) fires."