v.
Pronunciation: ˌ h ī -p ə r-ik- ' stend
Function: transitive verb
Date: 1883
: to extend so that the angle between bones of a joint is greater than normal <a hyperextend ed elbow> also : to extend (as a body part) beyond the normal range of motion < hyperextend ed her neck>
– hy · per · ex · ten · sion \ - ' sten(t)-sh ə n \ noun