Answer: This Idiom means the people with the slightest knowledge about anything will have more opinions.
Step-by-step explanation: This means that the vessel with the most minor water (for instance) will make the most noise. For example, considering the completely hollow drums will make a sound that is too loud. The basic idea behind this idiom is the same.
A very good example is as depicted:
Thomas: Hey Shane, do you know who is the person who is bullying Rachel in school?
Shane: Yes Thomas uncle.
Thomas: Could you give this letter to your class in charge complaining about that guy?
Shane: Why not uncle Thomas; but you know what he's an empty barrel that makes the loudest noise.
Thomas: I didn't get you, Shane.
Shane: As this time Rachel has topped the class and he was topper of the previous examination, he's just gossi[ping about here.
This is a perfect example of empty vessels making more noise.
This also depicts a society in another manner that without total knowledge keeps judging other humans.
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