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Choose the option in which the usage of the word is incorrect or inappropriate: side

A. The diplomat chose not to take sides in the complex geopolitical dispute.
B. Even amidst the economic downturn, she advised her colleagues to look on the bright side.
C. He kept a part-time job by the side, supplementing his income from his main profession.
D. To be on the safe side, the engineers added an extra layer of insulation to the critical component.

The incorrect or inappropriate usage of the word "side" is in option C: "He kept a part-time job by the side, supplementing his income from his main profession."
Why it's wrong:
The standard idiomatic expression for something done in addition to one's main occupation or income is "on the side", not "by the side". "By the side" typically refers to a physical location next to something.
Corrected sentence: "He kept a part-time job on the side, supplementing his income from his main profession."