Zihar is a term used in Islamic law that refers to a particular situation where a husband compares or equates his wife with someone or something that he perceives as forbidden for him to have sexual relations with.
For example, if a husband says something like "You are to me like the back of my mother," he is making a comparison between his wife and his mother's back, which is considered taboo in Islamic culture. This statement is considered to be a form of Zihar and is seen as an insult to the wife's honor and dignity.
It is important to note that the comparison made by the husband in Zihar must be explicit and direct, meaning that it cannot be a subtle or indirect comparison. Additionally, Zihar can have serious consequences under Islamic law, and the husband may be required to make amends or pay a penalty to his wife to rectify the situation.