1. let flow, make flow; spill; cast, mold; rain heavily. heavy rain; heavy continuous flow; act of pouring; cocktail party (Slang). pourpour , a. poor. [obs.]pour pour , v. t. [imp. & p. p. poured ; p. pr. & vb. n. pouring.] [oe. pouren, of uncertain origin; cf. w. bwrw to cast, throw, shed, bwrw gwlaw to rain.]