What does the expression "plead the fifth" mean?

Question

as in the amendment.

Answer 1

It means if you answer, you may incriminate yourself.   You plead the fifth so you don't admit to committing a crime or have knowledge of a crime being committed.

Answer 2

i plead the fifth on this question

Answer 3

It refers to the Fifth Amendment of the US Constitution giving a person the right not to incriminate himself.  This means he does not have to give evidence against himself.    A person may refuse to answer a question at a hearing on the grounds that it may tend to incriminate him.  Often they will say I refuse to answer on advice of counsel.  Or, I plead the Fifth Amendment.

Answer 4

I'm not gonna rat on myself!

Answer 5

The Fifth Amendment specifies our right to keep silent, to not give testimony that would lead to our arrest for a crime.