slattern away

verb1

1. •
   (old-fashioned) To consume carelessly or wastefully; to waste.

   • October 30, 1755 Philip Stanhope, 4th Earl of Chesterfield, The World I have known many a passion and many a friendship degraded, weakened, and at last, if I may use the expression, wholly slatterned away, by an unguarded and illiberal familiarity.