vi.

1. 下陷；下弯；下垂
   The branch sagged under the weight of the apples.

   树枝在苹果的重压下下垂了。

2. （面部等）松垂
3. （精神）萎靡；衰弱
4. （物价等）下降，下跌；萧条
   Interest rates were raised to brace up the sagging dollar.

   利率提高了，借以支撑疲软的美元。

5. 【海】漂流

vt.

1. 使下垂

n.

1. 下陷；下弯；下垂[U][S][（+in）]
   The chair seat had a slight sag.

   椅子的座位略微下陷。

2. 下垂度[U]
3. 【美】（道路等的）凹陷[C][S1]
4. 下降，下跌；经济萧条[S1]
   the sag in automobile sales

   汽车销售量的下降

5. 【海】漂流[U]

v.

n.

1. an instance of sagging.
2. Geometry  the amount of a downward curve, measured as the perpendicular distance from the middle of the curve to the straight line between the two supporting points.

n.