Answer:
You throw me out when you use me and take me in when you are done.
I hold two meanings. With one I may be broken with the other I hold on.
I am a vegetable that bugs stay away from
My first is a heir; My second's a snare; my whole is the offspring of fancy; which I sent out of play upon Valentine's day As a token of love to my Nancy.
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.