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cull (verb) pick for rejection.
When a farmer culls, he picks up a certain number of birds or animals, especially the weakest ones and kills them or has them killed, so that the group does not overgrow, and the number is kept within limits. A poultry farmer may cull some chicks for killing so that there are just the required numbers. That is, he selects some of them for killing. To gather material or information from various sources and select the relevant information is also to cull. 'He culled the material for his book on the evolution of clothing styles, from different sources.' This means that he collected material from various sources and selected some of it for his book on the subject.
- Every three months the farmer culls a minimum of a hundred pigs from his piggery and sends them to be butchered, with the desire of keeping the number of animals at a constant three hundred.
- In an exhibition of various artists' paintings, the art pieces were culled from various sources, with the culling made by some of the artists themselves.