المعنى الاصطلاحي :

Making something appear different from what it is really like.

الشرح المختصر :

"Ghishsh" (cheating) is that someone makes something appear to be different from what it is really like. This is of three cases: 1. Deluding someone into believing that a good quality exists in something while it does not exist in it. This is done by making something seem to be of good quality when it really is not; e.g. selling a ewe whose owner refrains from milking it until its udder becomes swollen so that whoever sees it thinks that it produces a lot of milk. 2. Concealing the presence of a flaw or deficiency; e.g. selling a commodity that has a flaw without telling the buyer about it. 3. Mixing something with another; e.g. mixing milk with water, or good quality wheat with low quality wheat. The scholars of Fiqh (Islamic jurisprudence) mentioned the criterion of prohibited cheating by saying: It is anything which, if a sane person knew about it and saw it, would cause him not to buy it for that price or totally reject it.

التعريف اللغوي المختصر :

"Ghishsh": showing something and hiding its opposite. A cheater is a "ghāshsh" or "ghashshāsh". Opposite: "nus-h" (advice). It isderived from "ghashash", which means unclear, turbid water.