Set aside or designated for a specific purpose or use.
From the practice of marking sheep's ears with notches or cuts to identify ownership, dating back centuries. The literal term 'earmark' became metaphorical in the 1500s to mean 'setting something aside for a purpose.' The prefix 'ear' combines with 'mark,' and past tense adds '-ed.'
It's wild that a farming practice of literally cutting sheep ears created a metaphor so powerful that modern governments use it for budget allocation—when a budget is 'earmarked' for education, it goes back to those ancient shepherds marking their property! The metaphor worked so well because the mark was permanent and specific.
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