whistle
blow and alert them so they see the auto coming blow to get PersonY's attention blow when boxers of violating rules call for PersonX coach the team get attention of people in line get the players' attention give commands help the pet keep the participants in check during boot camp make sounds to stop the game make students pay attention signal their team use to grab attention signal for help annoy someone with scare off a mugger scare off a bird play a song annoy a friend