the.com/birdie

The reward for being one stroke less embarrassing than usual.

means A golf score of one stroke under par on a given hole.

from From American golf slang in which something excellent was called 'bird' (as in 'that's a bird of a shot'), a usage tied to early-1900s slang where 'bird' meant anything first-rate. A birdie is the diminutive — a nice little bird of a score — and the name stuck, later spawning 'eagle' and 'albatross' for even better ones, and 'bogey' (unrelated in origin) for worse.

origin
from 1899 slang bird meaning excellent
golf math
one stroke under par on a hole
rarity check
average golfer sees maybe two per round
bonus term
eagle is two under, birdie's overachieving cousin
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