When they moved, they would go in any of the four directions, without turning as they moved. For wherever the head faced, the cherubim would go in that direction, without turning as they moved.
KJV
When they went, they went upon their four sides; they turned not as they went, but to the place whither the head looked they followed it; they turned not as they went.
ASV
When they went, they went in their four directions: they turned not as they went, but to the place whither the head looked they followed it; they turned not as they went.