Longman Dictionary of Contemporary English - birdie

~1 n 1 spoken a word meaning a little bird, used especially by or to children 2 one stroke1 (9) less than par1 (9) (=the usual number of strokes) in a game of golf1 (9) 3 AmE the small object that you hit across the net in a game of badminton shuttlecock BrE 4 watch the birdie old-fashioned used to tell people that you are going to take a photograph of them ~2 v to hit the ball into the hole in golf with one stroke1 (9) less than par1 (9) (=the usual number of strokes)