Jastrow: רָבִיב

רָבִיב m. (רָבַב) 1) lining, thick cloth. Sifré Deut. 306 (ref. to רביבים, Deut. XXXII, 2) זה … שמארגת את הרקיע כר׳ (Pesik. Zuṭr. Haăz., ed. Bub. p. 110 שמרבבת) that is the south wind which overweaves (which lines) the sky as with a thick lining; Yalk. ib. 942.—2) pl. רְבִיבִים (b. h.; רָבַב, cmp. רְבִיעָה) [growth-advancing,] rains. Sifré l. c. (ref. to Deut. l. c.) מה ר׳ הללו יורדים וכ׳ as the rains come down on plants &c.; Yalk. l. c. B. Bath. 25ᵃ (ref. to Deut. l. c.) זו רוח … ר׳ וכ׳ that is the south wind which brings rains and makes the plants grow; ib.ᵇ; a. e.