To straighten a limb, to diminish or extinguish the angle formed by flexion; to place the distal segment of a limb in such a position that its axis is continuous with that of the proximal segment. [L. ex- tendo, pp. -tensus, to stretch out]
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ex·tend ik-'stend vt
1) to straighten out (as an arm or leg)
2) to increase the quantity or bulk of (as by adding a cheaper substance or a modifier) <\extending ground meat with cereal> also ADULTERATE
Medical dictionary. 2011.