Definition of syne in English:

syne

adverb

Scottish
  • Ago.

    ‘I set out frae hame, about three weeks syne, taking my passage in the steam-boat at Ardrossan for Glasgow.’
    ‘I came to it weeks syne about the man ye'll maybe meet the morn's night.’

Origin

Middle English contraction of dialect sithen ‘ever since’.

Pronunciation

syne

/sʌɪn/