资料来源 : pyDict

下降,跌落;减少,缩小;变坏,衰退

资料来源 : WordNet®

fall off
     v 1: come off; "This button had fallen off"
     2: fall heavily or suddenly; decline markedly; "The real estate
        market fell off" [syn: {slump}, {sink}]
     3: diminish in size or intensity [syn: {fall away}]