n.

1. （牛、马等的）拴绳，系链[C]
2. （能力等的）限度，范围[the S]
   This is beyond my tether.

   这是我力所不能及的。

vt.

1. （用绳、链等）拴
   That boat was tethered to the ship by a rope. When the ship changed position, that boat moved as well.

   那艘小船是由一条绳索系于大船。当大船变动位置时，小船也跟着移动。

v.

n.