This word has several uses.
Go is used in a number of common expressions that refer to changes for the worse.
Common expressions are:
Go mad / go crazy / go deaf / go blind / go grey / go bald / go lame / go wrong / go bad / go off / go sour / go stale / go flat
He has gone mad.
The soup has gone bad.
The horse went lame.
The milk has gone sour.
What went wrong with it?
If a machine goes it works.
Is your clock going? (= Is your clock working?)
Go has several meanings. The meaning of go often depends on what kind of word comes after it.
These books go on the top shelf. (= These books are usually kept on the top shelf.)
The masts went in the storm. (= The masts broke in the storm.)
To go about something is to set to work at it.
Are we going about it in the right way?
Go by = be guided by
It is a good rule to go by.
Go down = sink
The ship went down without a trace.
Go for = be sold for
All his work went for nothing.
Go in for = take up as a hobby, pursuit
He went in for golf on retirement.