比喻很细微的恩怨。《资治通鉴・卷二四五・唐纪六十一・文宗太和九年》：“是时李训、郑注连逐三相，威震天下，于是平生丝恩发怨，无不报者。”
英语 gratitude for the slightest favour received or grudge against the slightest wrong done
