wyprostować

Etymology
From.

Verb

 * 1)  to right, to straighten
 * 2)  to make something stand or hang straight
 * 3)  to remove wrinkles or bumps from something
 * 4)  to explain, to make clear, to straighten
 * 5)  to straighten up
 * 6)  to get straightened
 * 7)  to be made clear, to get explained