This program takes a deeper look at words and expressions in the English language . Sometimes we take one word and see where it leads us . Today , we look at the word “fence .” One definition of "fence " is an outdoor structure that encloses an area . Fences mark property . They are barriers . A fence is different from a wall because it does not have a solid foundation along its whole length . Fences are used to keep things in -- like animals -- or keep things out -- like criminals . Speaking of criminals , when they deal in stolen goods they are fencing and could be called a fence . And if the criminals are fencing stolen goods while having a sword fight , you say they are fencing fences . But let's get back to “fence ” meaning an outdoor structure . As we said , a fence marks a property line . It gives you privacy . People can't see onto your property and vice versa . To many people , this is a good way to keep peace in a neighborhood . Everybody just minds their own business . Sometimes if a neighbor knows too much of your business , it could lead to problems . That is where this proverb comes from : “Fences make good neighbors .” Our next expression is very common : To be on the fence . If you are sitting “on the fence ” about something you are undecided . A fence divides property into sides . So , if you are on the fence about something , you have not taken sides . For example , let's say your child's school just raised $20,000 . School officials want to spend that money on either new science equipment or a new outdoor play area . They ask the parents to give their opinion . But you don't know which is more important for the students . So , you sit on the fence for awhile . You don't feel strongly about either choice . If you did , you would certainly pick a side and not stay on the fence . Sometimes we turn this saying into a noun . A "fence-sitter " is someone who always stays neutral . They never take sides in an argument . They do not seem to have an opinion of their own . And they never take a stance for anything . This could show a lack of courage . So , calling someone a fence-sitter is usually an insult . For example , let's say there is an election coming , and I have not decided who I am voting for . I can say , “I don't know . I'm on the fence between two candidates .” This doesn't mean I'm unwilling or unable to pick a candidate . I just haven't yet . However , let's say I never vote because I can't make a decision . And I have a long history of being indecisive . Someone could rightfully call me a fence-sitter . And that would rightfully be an insult .