whistle

口哨；汽笛；呼啸声英释nna small object that produces a high whistling sound when you blow into it

吹口哨；鸣汽笛英释vvto make a high or musical sound by blowing air out through your lips

1 blow the whistle,告发；揭发

2 clean as a whistle,擦得净亮

1 The lifeguard blew his whistle..救生员吹响哨子。