Anakupto describes rising from a bent posture or straightening oneself in response to what is happening.

The two occurrences depict movement from a bent or lowered posture to an upright one: inability to do so in Luke 13:11 and the command to do so, with lifted heads, in Luke 21:28.

1. Rising or straightening from a bent posture · dominant

   In Luke 13:11, the aorist active infinitive occurs in the statement that a bent woman could not become upright; the APB renders the clause “could not straighten up at all.” In Luke 21:28, the second-person plural aorist active form commands the hearers to straighten themselves and lift their heads as the stated events begin; the APB renders “straighten yourselves and lift up your heads.”

   Luke 13:11Luke 21:28

In the Anselm Project Bible: The APB presents the term with “straighten up” in Luke 13:11 and “straighten yourselves” in Luke 21:28. These renderings fit the surrounding clauses.