flat

plate / dish (object or food item) / cymbal / platter, turntable

the course of a meal, often consisting of a pasta dish, following the antipasto and before the secondo piatto

the main course of a meal, often consisting of meat or fish, following the primo piatto and before any dessert

soup plate

the best of meal courses, main course / the most interesting thing, highlight, foreground, highspot, high-performance

square meal

to bite the hand that feeds one; to saw off the branch one is sitting on

revenge is a dish best served cold

crab louse, crab (insect) / pain in the neck / cockroach