Sounds like “the dead”. Think: The dead (sah-DEH) are buried in the field.
There happen to be black sheep in that field, too. Black sheep = letter sin. The reasoning goes: since if you sin, you are the black sheep of the family. A way to remember spelling with sin or samech. My mnemonic for samech = stomach, since samech sounds like stomach. Have fun learning Hebrew with my other silly blog posts!