This means to bend over or kneel down very low to humbly express respect and honor toward someone. (See: [[rc://en/ta/man/translate/writing-symlanguage]])
Here "sons" stands for those who descended from Heth. See how you translated this in [Genesis 23:3](./03.md). Alternate translation: "the descendants of Heth" (See: [[rc://en/ta/man/translate/translate-names]])