וּשְׂנֵאָהּ֮ הָאִ֣ישׁ הָאַחֲרוֹן֒ וְכָ֨תַב לָ֜הּ סֵ֤פֶר כְּרִיתֻת֙ וְנָתַ֣ן בְּיָדָ֔הּ וְשִׁלְּחָ֖הּ מִבֵּית֑וֹ א֣וֹ כִ֤י יָמוּת֙ הָאִ֣ישׁ הָאַחֲר֔וֹן אֲשֶׁר־לְקָחָ֥הּ ל֖וֹ לְאִשָּֽׁה׃
e o segundo marido a desprezar, escrever para ela um certificado de divórcio, colocá-lo em sua mão e enviá-la para fora de sua casa, ou se o segundo marido morrer, que a tomou por esposa,
Rashi
ושנאה האיש האחרון AND IF THE LATTER HUSBAND HATE HER — (these words lit. mean: and the other will hate her): Scripture tells you that in the end he will hate her and divorce her, and if not, she will bury him (be the cause of his death) as it states “or if the latter husband die” (Sifrei Devarim 270:4-5).
Ibn Ezra
divorce so called because they are completely divorced from being married.
Siftei Chakhamim
Scripture informs him that he will ultimately hate her, etc. Otherwise it should have said, “If (אם) her last husband hates her.”