Hypertext Webster Gateway: "flexing"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Flex \Flex\, v. t. [imp. & p. p. {Flexed}; p. pr. & vb. n.
{Flexing}.] [L. flexus, p. p. of flectere to bend, perh.
flectere and akin to falx sickle, E. falchion. Cf. {Flinch}.]
To bend; as, to flex the arm.
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