A guard is either a person or an organisation. It may be a person who looks after the safety of people or property, and/or make sure prisoners do not escape. It may also be a part of the military. It can also be an object, a fireguard for example.
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Madame Bovary
Molly Bloom's Soliloquy
Warning: Wikipedia contains spoilers
Outline of the Plot
The title character, Anna, is the wife of the ...