fence/ fεns /

1.noun [c] 
(barrier) 篱笆

2.vt.[+land] 
(also: fence in) 把…用篱笆围起

3.vt.
(also: fence off) 把…用篱笆圈起

4.vi.[Sports] 
击剑

to sit on the fence
 [fig] 持观望态度