Definition of know-all-about-it in English:

know-all-about-it

adjective

rare
  • Attributive Knowing, or appearing to know, all about something.

Origin

Late 19th century; earliest use found in John Ruskin (1819–1900), art critic and social critic. From know + all + about + it.

Pronunciation

know-all-about-it

/ˌnəʊɔːləˈbaʊtɪt/