Rashi on Exodus 9:33/רש"י על שמות ט׳:ל״ג

1לא נתך means [RAIN] DID NOT REACH the earth (i. e. no fresh rain came down) — that rain, too, which was alredy in the air at the moment when Moses was praying remained there and did not reach the ground. In a similar sense is “ותתך עלינו the curse and the oath” — a passage in the book of Ezra (really, Daniel 9:11) — which signifies, “the curse and the oath have reached us”. But Menachem ben Seruk classified it in the same section as, (Ezekiel 22:22) “כהתוך כסף” which has the meaning of melting (pouring forth) metal. I agree with his opinion, because in the Targum we render ויצק, (Onkelos Exodus 38:5) “And he cast (metal)”, by ואתיך, and (Onkelos Exodus 38:27) לצקת, “to cast (metal)” by לאתכא, each of these Aramaic words being of the same root as our word נתך. Therefore לא נתך ארצה would mean: rain was not poured out to the ground.