postrar

Etymology
Dissimilated from (e.g.  in, 13th century), a borrowing from , backformed from , perfect passive participle of.

Verb

 * 1) to prostrate, lie prostrate, to lie low
 * 2)  to prostrate oneself, to kneel, to fall to one's knees (in obedience, to beg etc.)
 * 3) to debilitate