The best or finest of a group; the top quality items or people from a larger selection.
This phrase dates to the mid-1800s and draws from dairy farming, where cream naturally rises to the top of milk and represents the richest, most valuable part. The 'crop' refers to any harvest or collection, extending the agricultural metaphor to mean the best yield from any group.
Interestingly, this phrase perfectly captures a natural physical process as a metaphor for quality - cream literally has less density than milk, so it floats upward without any human intervention. The phrase has spawned variations in other languages, with French using 'la crème de la crème' to mean the very best of the best.
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