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contract;
"flex a muscle"
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exhibit the strength of;
"The victorious army flexes its invincibility"
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form a curve;
"The stick does not bend"
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bend a joint;
"flex your wrists"
"bend your knees"
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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"