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A birdie is one stroke under par on a given hole.
5 under par
2 under par on one hole.
one under par for that hole is par 4 and you get 3
For a round of golf- one under. For a given hole- a birdie.
2 under par on one hole.
1 shot is hole in one 1 shot under par is birdie 2 shots under par is eagle 3 shots under par is albatross Over par is boogie.
one under par = eins unter par
You make a good point, it is a strange one. But in this context par is meant to mean, the average, of the usual quality etc, so below par essentially means sub standard, and has nothing to do with golf.
A score of one under par
one under par is called a "birdy" 2 under par is called "eagle"