Synonyms for Go downhill:

• v.

  •come down (verb)
  • descend,
  • decrease,
  • fall,
  • suffer,
  • reduce.
  •decline (verb)
  • diminish,
  • sag,
  • decay,
  • revert,
  • return,
  • dwindle,
  • cheapen,
  • lapse,
  • depreciate,
  • fall off,
  • pine,
  • abate,
  • droop,
  • wane,
  • weaken,
  • backslide,
  • ebb,
  • languish,
  • shrink,
  • drop,
  • lower,
  • sink,
  • flag,
  • subside,
  • retrograde,
  • slide,
  • fade,
  • settle.
  •degenerate (verb)
  • deprave,
  • corrode,
  • retrogress,
  • corrupt,
  • regress,
  • lessen,
  • slip,
  • vitiate,
  • go to pieces.
  •deteriorate (verb)
  • lose it,
  • atrophy,
  • impair,
  • lose quality,
  • decompose,
  • alloy,
  • spoil,
  • downgrade,
  • wear away,
  • pervert,
  • adulterate,
  • fall apart,
  • break,
  • dilapidate,
  • crumble,
  • collapse,
  • wither,
  • become worse,
  • tergiversate,
  • skid,
  • moulder,
  • wilt,
  • debilitate,
  • undermine,
  • debase,
  • mar,
  • injure,
  • putrefy,
  • degrade,
  • be worse for wear.
  •die (verb)
  • expire,
  • melt away,
  • molder,
  • fade away,
  • run down,
  • slacken,
  • fade out,
  • disappear,
  • halt,
  • moderate,
  • run out,
  • stop,
  • lose power,
  • bate,
  • run low,
  • end,
  • vanish,
  • fizzle out,
  • let up,
  • peter out,
  • pass,
  • ease off,
  • rankle,
  • break down,
  • go bad.
  •fail (verb)
  • fall flat,
  • go up in smoke,
  • hit bottom,
  • lose status,
  • fizzle,
  • be ruined,
  • blunder,
  • meet with disaster,
  • miss,
  • fold,
  • go wrong,
  • fall short,
  • fall through,
  • come to naught,
  • flop,
  • lose control,
  • be found lacking,
  • go down swinging,
  • flounder,
  • turn out badly,
  • be demoted,
  • play into,
  • founder,
  • back wrong horse,
  • be in vain,
  • be defeated,
  • abort,
  • lose out,
  • go down,
  • miss the boat,
  • go astray,
  • run aground,
  • come to nothing.
  •miscarry (verb)
  • miss fire,
  • miss the mark,
  • misfire.
  •rot (verb)
  • demoralize,
  • taint,
  • debauch,
  • stain,
  • perish,
  • warp,
  • turn,
  • fester.
  •slump (verb)
  • blight,
  • slouch,
  • bend,
  • loll,
  • keel over,
  • tumble,
  • topple,
  • hunch.
  •worsen (verb)
  • aggravate,
  • depress,
  • exacerbate,
  • damage.

• Other synonyms:

  •deteriorate
  • lost it,
  • wears away,
  • wearing away.
  •die
  • dilapidates,
  • easing off,
  • breaking down,
  • slackens,
  • goes bad,
  • fading out,
  • running out,
  • petering out,
  • fading away,
  • lost power,
  • fades away,
  • ran low,
  • Dilapidating.
  •fail
  • founders,
  • Floundered,
  • going wrong,
  • goes astray,
  • be vain,
  • missed the boat,
  • failed,
  • goes wrong,
  • falling short,
  • went astray,
  • going astray.
  •miscarry
  • missed the mark.
  •Other relevant words:
  • err,
  • rise,
  • incline,
  • crash,
  • parachute,
  • become dilapidated shabby,
  • down,
  • lean,
  • falter,
  • faint,
  • retreat,
  • pitch,
  • list,
  • give way,
  • pounce,
  • keel,
  • come apart,
  • slope,
  • give out,
  • sway,
  • swoop,
  • plunge,
  • wear thin,
  • fall away,
  • wrong,
  • grade,
  • rake,
  • become worn shabby,
  • dip,
  • swag,
  • precipitate,
  • rain,
  • uprise,
  • slant,
  • become dilapidated out,
  • careen,
  • cataract,
  • seed,
  • become worn out,
  • bank,
  • cant,
  • tip,
  • gravitate,
  • conk out,
  • shelve,
  • tilt,
  • go under,
  • touch bottom,
  • fall from grace,
  • recidivate,
  • climb,
  • cascade,
  • go off,
  • waste,
  • stoop,
  • plummet.

Antonyms for Go downhill:

• v.

  • come down
    boost, improve.
  • decline
    compliment, flourish, develop, grow, expand, laud, say yes, enlarge, raise, increase, rise, praise, build, extend, accept, advance, reach, win, enhance, ascend, progress, go up, strengthen.
  • degenerate
    aid, help.
  • deteriorate
    assist, fix, purify, join, put together, clean, approve, cleanse, clear, construct, heal, get better, mend, cure, elevate.
  • die
    forward, continue, appear, forge, bear, arrive, begin, prolong, be born, commence, live, start.
  • fail
    achieve, finish, procure, merit, prosper, capture, accomplish, complete, correct, deliver, gain, succeed, obtain, do well, earn.
  • rot
    combine, unite, upgrade, moralize.
  • sink
    fight, float, brave.
  • slump
    straighten.
  • worsen
    make happy, soothe, comfort.