What does "flex" mean?

[Rudi]

Business English Lesson, Advanced Level

ESL/EFL Test #196 "Selling to Businesses", question 1

The amount of purchasing undertaken in the business market easily ......... the total spending by consumers; because the business market is so large it draws the interest of millions of companies that market exclusively to business customers.

(a) belittles
(b) diminishes
(c) dwarfs
(d) shrinks

Business English Lesson, Advanced Level

ESL/EFL Test #196 "Selling to Businesses", answer 1

The amount of purchasing undertaken in the business market easily dwarfs the total spending by consumers; because the business market is so large it draws the interest of millions of companies that market exclusively to business customers.

Correct answer: (c) dwarfs
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what is the meaning of "FLEX"

[Mister Micawber]

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FLEX is in the dictionary.
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Native English teacher at Mister Micawber's