backfire

1. V-I If a plan or project backfires, it has the opposite result to the one that was intended. 事与愿违

The president's tactics could backfire. 总统的策略可能会事与愿违。

2. V-I When a motor vehicle or its engine backfires, it produces an explosion in the exhaust pipe. (机动车或引擎) 回火

The car backfired. 这辆车回火了。