You can tell lunch meat is past its prime by appearance, color, texture and smell. If it has become slimy or ropey, has odd things growing on it (like mold or pink slime), has changed color, turned...
a deli is a sandwitch shop.
It's difficult to tell but smell of it. If it smells kind of sour, then throw it out. It generally doesn't last longer than ten days.
according to my crossword puzzle, a deli crepe is a blini
Food.