NET
27 This is what prompted him to rebel against the king: Solomon built a terrace, and he closed up a gap in the wall of the city of his father David.
Darby
27 And this was the cause that he lifted up his hand against the king: Solomon was building Millo, and closing the breach of the city of David his father;
KJV
27 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.