There are 2 main definitions of dilly in English:

dilly1

Line breaks: dilly
Pronunciation: /ˈdɪli
 
/

noun (plural dillies)

[usually in singular] North American informal
An excellent example of a particular type of person or thing: that’s a dilly of a breakfast recipe
More example sentences
  • The nameless viewpoint racer is making 'one last run', and it's a dilly.
  • At only $14.95 it's a dilly of a deal for this long sold-out series, previously available only in hardcover (if you could find it).
  • This is their first effort to publish a shotshell reloading manual, and it's a dilly.

Origin

late 19th century (as an adjective in the sense 'delightful'): alteration of the first syllable of delightful or delicious.

Definition of dilly in:

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There are 2 main definitions of dilly in English:

dilly2

Line breaks: dilly
Pronunciation: /ˈdɪli
 
/

adjective (dillier, dilliest)

Australian /NZ informal , dated
Odd; foolish.
More example sentences
  • She'll get it dirty, get it trodden on, silly, dilly girl.
  • ‘This is a double dilly sale,’ the youth desperately screams, then cocks his head in amazement of the sentence he just uttered.

Origin

late 19th century: perhaps a blend of daft and silly.

Definition of dilly in: