ESV: And this was the reason why he lifted up his hand against the king. Solomon built the Millo, and closed up the breach of the city of David his father.
NIV: Here is the account of how he rebelled against the king: Solomon had built the terraces and had filled in the gap in the wall of the city of David his father.
NASB: Now this was the reason why he rebelled against the king: Solomon built the Millo, and closed up the breach of the city of his father David.
CSB: and this is the reason he rebelled against the king: Solomon had built the supporting terraces and repaired the opening in the wall of the city of his father David.
NLT: This is the story behind his rebellion. Solomon was rebuilding the supporting terraces and repairing the walls of the city of his father, David.
KJV: And this was the cause that he lifted up his hand against the king: Solomon built Millo, and repaired the breaches of the city of David his father.
NKJV: And this is what caused him to rebel against the king: Solomon had built the Millo and repaired the damages to the City of David his father.