Charles Ellicott Commentary Genesis 41:43

"and he made him to ride in the second chariot which he had; and they cried before him, Bow the knee: and he set him over all the land of Egypt." — Genesis 41:43 (ASV)

In the second chariot. —The object of this procession was to display Joseph to the people as their new governor. The Pharaoh, probably, took the chief part in this parade, riding in the first chariot of state.

Bow the knee. —Hebrew, abrech. Canon Cook explains this as meaning rejoice, be happy. It is in the imperative singular, and is addressed by the people to Joseph; for it is said they cried before him, that is, the multitude, and not a herald. Naturally, therefore, it is in the singular, as the vivat rex of the Middle Ages, or vive le roi now. The similarity of sound with habrech, bow the knee, is a mere chance and as this word also is singular, it must be addressed to Joseph, and not to the people.