Matthew Poole and continuators on Judges 14:17

17 And she wept before him the seven days, while the feast lasted : and it came to pass on the seventh day, that he told her, because she lay sore upon him: and she told the riddle to the children of her people.

i. e. On the residue of the seven days; to wit, after the third day. It is a familiar Synecdoche. Or, on the seventh of the days on which the Feast was: And then the following Clause, on the seventh day, is only the Noun repeated for the Pronoun, on that day; as is most frequent, as 1 King. 8. 1. Solomon assembled—unto Solomon, i. e. unto himself.

Marginal references: Or, the rest of the seven days, &c.