Genesis 10:8

להיות גבור TO BE A MIGHTY ONE — Mighty in causing the whole world to rebel against the Holy One, blessed be He, by the plan he devised for the generation that witnessed the separation of the races (דור הפלגה) to build the Tower of Babel (Genesis Rabbah 23:7).

וְכ֖וּשׁ יָלַ֣ד אֶת־נִמְרֹ֑ד ה֣וּא הֵחֵ֔ל לִֽהְי֥וֹת גִּבֹּ֖ר בָּאָֽרֶץ׃

And Kush begot Nimrod: he began to be a mighty one in the earth.