becoming lower, smaller or weaker 下降：變得更低，更小或更弱 The declining birth rate is common to all developed countries. 出生率下降是所有發達國家的通病。 declining sales/revenues 銷售額/收入下降 Declining health forced him to retire from business. 健康狀況惡化迫使他從商界退休。
Idioms
somebody’s declining years
- (literary)
the last years of somebody’s life 暮年；晚年