Definition of swy in English:

swy

noun

NZ, Australian
  • another term for the game of two-up
    • ‘During the voyage most of the men amused themselves by playing swy or two-up, and dice games.’
    • ‘The boxer would call and ask for a spinner, who would have the right to select whether he wanted to play two-up or swy (also know as ‘sudden death’).’

Origin

1940s: from German zwei ‘two’.

Pronunciation

swy

/swʌɪ/