The FFF submethod states that words can be named by Form, Feel, and Function.
• Some examples of naming words by Form include (a) the leg of a chair, (b) the handle of a pot, (c) the branch of a family tree, (d) surfing the net or (e) brainstorming Some of these examples illustrate naming objects by form while other examples illustrate naming activities by form.
• A good punchy example distinguishing naming by form vs. function is pentagon-UN. The pentagon is named after the shape and form of the building while the United Nations is named after the function and purpose of the building. Although both these buildings have as a purpose world peace they are named differently.
• Examples of naming by feel/substance are glasses, hardship, ironing-board, plaster etc.

The FFF principle is a special case of the literary techniques of synechdoche-metonomy. These literary principles, universal to all languages, state that items can be named by related items, by parts of those items, or by good examples of those items. For example honey refers to anything sweet since honey is a good example of something sweet. Similarly hot refers to matters of love since the two are related. Todays Rashi can best be understood by applying these principles.

The following etymology is due to Rabbi Hirsch: The Hebrew root Shin/sin-Cheth-Teth means to slaughter. Slaughter has the form of a cutting motion which releases a red liquid from the slaughtered being who then dies. But then squeezing a grape till its red liquid oozes from it into a wine vat has the same form as slaughter. Hence the Hebrew root Sachat etymologically comes from the Hebrew root Shachat. One means slaughter of animals and one means squeezing of grapes.