What does Deuteronomy 28:68 mean?

The Lord will send you back to Egypt in ships, even though He once promised you'd never go back that way. There, you'll try to sell yourselves as slaves to your enemies, but no one will want to buy you. Deuteronomy 28:68 - Modern Text Bible

(The ultimate humiliation: returning to the place of former slavery, but now so desperate that even as slaves, they're unwanted.)