An expression used to substitute a word with unpleasant or offensive connotations is known as a(n) a. euphemism b. hyperbole c. oxymoron d. understatement

A. Euphemism

Explanation:

Euphemisms are idiomatic expressions that are mild, indirect or polite, used to substitute a word with unpleasant, offensive or harsh connotations. We tend to use these expressions frequently, sometimes without even realising it, some of them are: "He bit the dust" instead of "he died", "The company has a negative cash flow" instead of "It's broke", "She's over the hill and picking up speed" instead of "she's really old" and "Comfort woman" instead of "prostitute".

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Explanation: