(pl. -ies)［usu. in sing.］
- N. Amer. informal an excellent example of a particular type of person or thing〈北美, 非正式〉佼佼者; 精品：
that's a dilly of a breakfast recipe.
那真是早餐食谱中的精品了。
词源
late 19th cent. （as an adjective in the sense 'delightful'）： alteration of the first syllable of DELIGHTFUL or DELICIOUS.