32 So because Gideon broke down Baal’s altar, they gave him the name Jerub-Baala that day, saying, “Let Baal contend with him.”

Read Judges 6:32 Using Other Translations

Therefore on that day he called him Jerubbaal, saying, Let Baal plead against him, because he hath thrown down his altar.
Therefore on that day Gideon was called Jerubbaal, that is to say, "Let Baal contend against him," because he broke down his altar.
From then on Gideon was called Jerub-baal, which means “Let Baal defend himself,” because he broke down Baal’s altar.