In golf, if you get a birdie, you get the golf ball into a hole in one stroke fewer than the number of strokes which has been set as the standard for a good player.
VERB
（高尔夫运动中）在…打出小鸟球；以低于标准杆一杆的成绩入（洞）
If a golfer birdies a hole, he or she gets a birdie at that hole.