1. 動詞
   不及物動詞:
   下降, 下跌
   走衰
   減少
   衰退, 衰落
   婉拒, 謝絕
   拒絕
   傾斜, 下垂
   及物動詞:
   婉拒...(邀請、提議等)
   

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   同義字詞
   balk (at),disapprove,negative,nix,pass,pass up,refuse,reject,reprobate,repudiate,spurn,throw out,throw over,turn down
   deny,disallow,disapprove,negative,nix,refuse,reject,reprobate,withhold
   crash,descend,dip,dive,drop,fall,lower,nose-dive,plummet,plunge,sink,skid,tumble
   atrophy,crumble,decay,degenerate,descend,deteriorate,devolve,ebb,regress,retrograde,rot,sink,worsen
   abate,de-escalate,decrease,die (away or down or out),diminish,drain (away),drop (off),dwindle,ease,ebb,fall,fall away,lessen,let up,lower,moderate,pall,phase down,ratchet (down),rachet (down),recede,relent,remit,shrink,subside,taper,taper off,wane
   descend,dip,drop,fall,plunge,sink
   

2. 名詞
   下降, 減少
   走衰
   a decline in ...(可數量化之事物、程度上可測量之事物等)/
   a decline of ...(組織、權力、地位、健康、數值等):
   ...的下降
   ...的減少
   ...的衰退
   /以上複數為"declines"/
   限定單數the decline:
   傾斜
   

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   同義字詞
   debilitation,decay,decaying,degeneration,descent,deterioration,ebbing,enfeeblement,weakening
   decadence,declension,declination,degeneracy,degeneration,degradation,descent,deterioration,devolution,downfall,downgrade,ebb,eclipse,fall
   declension,declivity,descent,dip,downgrade,downhill,fall,hang,hanging
   comedown,demise,descent,down,downfall,fall
   abatement,decrease,decrement,dent,depletion,depression,diminishment,diminution,drop,drop-off,fall,falloff,loss,reduction,shrinkage,step-down
   

3. 形容詞
   on the decline/
   in decline:
   在衰退中的
   在衰退的
   衰落中的
   走衰中的
   在衰落的
   在減少中的
   在下降的
   

例句

1. By the 1980s, Charlton was in decline .
2. Then his moral fiber shall begin to decline .
3. Monarch butterflies are currently in decline .
4. Birds of prey whirl when the ratings decline .
5. The traffic then continued to decline gradually.
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