vi.

1. 下降，下跌；減少；衰退，衰落
   As one grows older one's memory declines.

   人的記憶力隨著年齡增長而衰退。

   Unemployment declined to 4 percent last month.

   上個月失業率降至百分之四。

2. 【書】傾斜；下垂
3. 婉拒；謝絕

vt.

1. 婉拒；謝絕[+to-v]
   She declined their invitation.

   她婉拒了他們的邀請。

   She declined to have lunch with her friend, saying that she wasn't feeling well.

   她說她身體不舒服，婉拒了與她的朋友共進午餐。

2. 【文】使發生詞尾變化，使變格

n.

1. 下降；減少[S1]
   There is a decline in real wages.

   實際薪資有所減少。

2. 衰退，衰落[the S]
3. 最後部分；晚年[the S]
4. 傾斜[the S]

v.

1. become smaller, fewer, or less; decrease.
   ▸diminish in strength or quality; deteriorate.
2. politely refuse:
   the company declined to comment.
3. (especially of the sun) move downwards.
4. Grammar  state the forms of (a noun, pronoun, or adjective) corresponding to cases, number, and gender.

n.

1. a continuous loss of strength, numbers, or value.
2. archaic a disease in which the bodily strength gradually fails, especially tuberculosis.