The phrase 'Go with the Flow' means to do what other people are doing or agree with their opinions.
You can use the idiom 'Go with the Flow' to tell someone he should be more conservative or less radical.
Example of Use: "I never know what to expect when I'm with them, so I've learned that the best thing to do is just go with the flow."
No one is certain of the origin of the idiom 'go with the flow,' but like many expressions, it is closely related to William Shakespeare’s work. In Julius Caesar, Brutus says: “There is a tide in the affairs of men, which, taken at the flood, leads on to fortune. Omitted, all the voyage of their life is bound in shallows and in miseries. On such a full sea are we now afloat, and we must take the current when it serves, or lose our ventures.”