1) Decreasing 2) Deducting 3) Diminishing 4) Dying down 5) Easing off 6) Falling off 7) In a decline 8) Lessening 9) Letting up 10) Like remittent diseases 11) Settling down 12) Slacking off 13) Slacking off, dyeing away 14) Subsiding Found on https://www.crosswordclues.com/clue/abating