7.to burn your fingers or to get your fingers burnt(因失败或做错事而)吃苦头
He has had his fingers burnt by deals that turned out badly.他因为生意惨败而吃了大亏。
Mr Walesa burned his fingers by promising he would give every Pole 100m zlotys to start a business.瓦文萨先生因为答应给每个波兰人一亿兹罗提做生意而大吃苦头。