Answer:
I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.
Whipping one of these out in the wrong setting is said to be terrible luck.
What kind of cup doesn't hold water?
You are owed one of these when someone wrongs you
You speak this when you are being sincere.
I am a rock group with four members. All dead one was assassinated.