"To entreat (a person) earnestly; to implore, beseech, supplicate; to beg (a thing)", Late 16th cent. From classical Latin obsecrāt-, past participial stem of obsecrāre to beseech, entreat, implore from ob- + sacrāre to make sacred, hence lit. ‘to beseech in the name or for the sake of something sacred’.[obsecrate etymology, obsecrate origin, 英语词源]