Quickness and cleverness in expression is -

• Quickness and cleverness in expression is - Wit.
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• Wit:
​​- A brief and brilliant expression intended to produce surprise and pleasure.
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• ​উল্লিখিত বাকি অপশনগুলো,
​​- A thing which stands for something else is - Symbol.
​- The central idea of a literary work is - Theme.
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​Source: An ABC of English Literature by Dr. M Mofizar Rahman.