In golf, to score two strokes under par on a hole; past tense of the verb 'eagle.'
From 'eagle' used as a verb in golf terminology, which emerged in the early 1900s. The term parallels 'birdie' (one under par), creating a bird-themed scoring hierarchy where eagles beat birdies.
Golf terminology created 'birdie' and 'eagle' as slang that became official—so golfers scoring well hit birds, while bad scores don't have animal names, showing how sports slang can become standardized language.
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