This means that the person who said it is "watching your back", and is there to support you. "Watching your back" or "Got your back" means that they are in support and there to defend you if needed.
in Britain it was Winston Churchill
Winston Churchill
offer evidence in support of the thesis statement
Hypothesis.
That is called a premise. Premises are propositions used in arguments to support a conclusion.
There is no definitive evidence to support the existence of a carman Winston story. It is possible that it could be a work of fiction or a myth rather than a true story.
Not if supporting your thesis statement was part of the assignment.
It is evidence in support of a fact or statement
the thesis statement
statement of arrears
There is no evidence to support this statement.