verb

become progressively worse.

relations between the countries had deteriorated sharply

worsen,get worse,decline,be in decline,degenerate,decay,collapse,fail,fall,drop,sink,slump,slip,slide,go downhill,go backwards,go to rack and ruin,stagnate,wane,ebb,go to pot,go to the dogs,hit the skids,go down the toilet,go down the tubes,go to the pack,retrograde,degrade,break down,decompose,rot,putrefy,go bad,go off,spoil,perish,wither,atrophy,weaken,fade,break up,disintegrate,become dilapidated,crumble,fall down,fall apart,fall to pieces,corrupt

verb

become progressively worse.

relations between the countries had deteriorated sharply

worsen,get worse,decline,be in decline,degenerate,decay,collapse,fail,fall,drop,sink,slump,slip,slide,go downhill,go backwards,go to rack and ruin,stagnate,wane,ebb,go to pot,go to the dogs,hit the skids,go down the toilet,go down the tubes,go to the pack,retrograde,degrade,break down,decompose,rot,putrefy,go bad,go off,spoil,perish,wither,atrophy,weaken,fade,break up,disintegrate,become dilapidated,crumble,fall down,fall apart,fall to pieces,corrupt

verb

become progressively worse.

relations between the countries had deteriorated sharply

worsen,get worse,decline,be in decline,degenerate,decay,collapse,fail,fall,drop,sink,slump,slip,slide,go downhill,go backwards,go to rack and ruin,stagnate,wane,ebb,go to pot,go to the dogs,hit the skids,go down the toilet,go down the tubes,go to the pack,retrograde,degrade,break down,decompose,rot,putrefy,go bad,go off,spoil,perish,wither,atrophy,weaken,fade,break up,disintegrate,become dilapidated,crumble,fall down,fall apart,fall to pieces,corrupt