Definition of soft tack in English:

soft tack

noun

archaic
  • [mass noun] Bread or other nourishing food, especially as eaten by sailors or soldiers:

    ‘we had butter and soft tack twice a week’
    • ‘And every day we'll eat soft tack and live on steak and duff.’
    • ‘While at Carondelet we who had money lived on soft tack and milk so you see we had good healthy food.’