Lewis & Short

prolongo, āvi, 1, v. [pro-longus], to lengthen, prolong, extend (late Lat. for prorogo, profero, duco): dies, Vulg. Deut. 6, 2: iniquitatem suam, id. Psa. 128, 3; Hilar. ad loc.; id. in Psa. 119, 13; Aug. Serm. 9, 2: sermonem, Vulg. Ezech. 12, 28.