Cull

1. A selection.
2. An organised killing of selected animals.
3. (farming) An individual animal selected to be killed, or item of produce to be discarded.
4. (seafood industry) A lobster having only one claw.
5. A piece unfit for inclusion within a larger group; an inferior specimen.

1. To pick or take someone or something (from a larger group).
2. To gather, collect.
3. To select animals from a group and then kill them in order to reduce the numbers of the group in a controlled manner.
4. To kill (animals etc).
5. To lay off in order to reduce the size of, get rid of.

noun

A fool, gullible person; a dupe.