n.

1. 棒，杆，竿[C]
   The rod bent as he pulled in the fish.

   当他把鱼拉上来时，鱼竿都弯了。

2. 枝条，柳条[C]
3. （拷打用的）荆条，棍棒[C]
   Spare the rod, spoil the child.

   不打不成器。

   I knew I was in trouble when I was taken to the garage with a rod.

   当我被人拿着鞭子赶到车库时，我知道我惹下麻烦了。

4. 拷打，惩罚[the S]
   What do you think of the old saying: "Spare the rod, spoil the child."?

   你对“孩子不打不成器”这句老话怎么看？

5. 杆（长度单位，等于5.5码）
6. 权杖[C]
7. 权力，权威；专制统治[the S]

n.

1. a thin straight bar, especially of wood or metal.
2. a fishing rod.
3. a slender straight stick or shoot growing on or cut from a tree or bush.
   ▸ (the rod) the use of a stick for caning or flogging.
4. historical, chiefly Brit. another term for perch³ (in sense ¹).
   ▸ (also square rod) another term for perch³ (in sense ²).
5. US informal a pistol or revolver.
6. Anatomy  one of two types of light-sensitive cell present in the retina of the eye, responsible mainly for monochrome vision in poor light. Compare with cone (in sense ³).