The figurative language that is used in the statement; "The boy was so weak he couldn’t fight his way out of a wet paper bag" is an Idiom.
An idiom refers to the usage of words in ways that indicate that they should be mainly understood in their figurative forms. The term, "wet paper bag" in the text above is used to show that the boy was unable to fight even the weakest of things.
Everyone knows that a wet paper bag is very soft and should be easily conquered by anyone. But we are made to understand that the boy was so weak that he could not even fight his way out of a wet paper bag. This goes to show that he had become so weak and powerless that even a paper bag was difficult for him to fight.
Idioms are figurative languages that make the text more interesting to read and understand. The visualization prompted by the use of the phrase makes the text more comprehensible.
Learn more about idioms here:
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