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nosedive slip slide sink sicken revert return retrogress retrograde retrocede retract resile relapse regress recoil recidivate putrefy slump standstill subside go to pieces de-escalate fall away move back turn back pick up go down worsen wither wilt whither weaken wane vitiate tumble taper lessen lapse languisher devolve deteriorate descend depreciate degrade degenerate decline decay crumble compound collapse