Rashi on Deuteronomy 21:14/רש"י על דברים כ״א:י״ד

1והיה אם לא חפצת בה AND IT SHALL BE, IF THOU ART NOT PLEASED WITH HER — Scripture tell you that you will in the end hate her (Sifrei Devarim 214:1).

2לא תתעמר בה means; THOU SHALT NOT USE HER AS A SLAVE. In the Persian language slavery and servitude is termed עימראה. I learned this from the work of R. Moses the Preacher.