Definition of square dinkum in English:

square dinkum

adjective

Australian, NZ
informal, rare
  • Honest, above board; true. Also: fair, just. specifically Sport (of a game, match, etc.): fairly, honestly, or gamely contested; (also of a participant) playing, fighting, etc., with spirit, courage, and integrity.

Origin

Late 19th century (in an earlier sense). Either (i) from square + dinkum, after fair dinkum.

Pronunciation

square dinkum

/ˌskwɛː ˈdɪŋkəm/