Flex
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.
[1913 Webster]

-- From The Collaborative International Dictionary of English v.0.48

Flex Flex, n.
Flax. [Obs.] --Chaucer.
[1913 Webster]

-- From The Collaborative International Dictionary of English v.0.48