He spit-shined his resume until every detail was impeccable.

spit-shined 是由 spit（唾液）和 shine（擦亮）组成的复合动词过去式，字面意思是"用唾液擦亮"。这里用作比喻，表示"精心打磨、细致润色"的意思。这种表达源自军队用语，指士兵用少量唾沫来快速擦亮皮鞋使其发亮的做法。