Rashi on Genesis 41:14/רש"י על בראשית מ״א:י״ד

1מן הבור OUT OF THE DUNGEON — from the place of imprisonment which was made as a kind of pit Similarly, wherever בור occurs in Scripture it signifies a pit — even though it does not contain water (for בור is used of a cistern, excavated as a pit out of rocks) it is still called a בור; old French fosse.

2ויגלח AND HE CLIPPED HIS HAIR, out of respect for the king (Genesis Rabbah 89:9).