"flexing" in the verb sense
1. flex
contract
"flex a muscle"
2. flex
exhibit the strength of
"The victorious army flexes its invincibility"
3. bend, flex
form a curve
"The stick does not bend"
4. flex, bend
bend a joint
"flex your wrists"
"bend your knees"
5. flex, bend, deform, twist, turn
cause (a plastic object) to assume a crooked or angular form
"bend the rod"
"twist the dough into a braid"
"the strong man could turn an iron bar"
Source: WordNet® (An amazing lexical database of English)
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