A person or animal that crops, cuts off, or removes the tops or outer parts of plants.
From 'crop' (to cut or harvest) plus the agent suffix '-a' or '-er', creating a word for someone who performs the action of cropping.
The '-a' ending here is unusual in modern English (we'd normally say 'cropper'), which suggests this is an older or dialectal form that survived in certain regional vocabularies or specialized contexts.
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