whistle

音标发音

whistle用作名词时意思是“口哨”,转化为动词时意思是“吹口哨”“吹(笛等)”“鸣笛”,引申可表示“呼啸着前进”。与介词for连用还可表示“空指望”“指望”。
whistle可用作及物动词,也可用作不及物动词。用作及物动词时,接名词或代词作宾语。还可接以动词不定式充当补足语的复合宾语。

to make a high sound by forcing air through a small hole or passage, especially through the lips, or through a special device held to the lips
the sound made by someone or something whistling

When you whistle or when you whistle a tune, you make a series of musical notes by forcing your breath out between your lips, or your teeth.
When someone whistles, they make a sound by forcing their breath out between their lips or their teeth. People sometimes whistle when they are surprised, or to call a dog, to get someone's attention, or to show that they are impressed.
Whistle is also a noun.
If something such as a train or a kettle whistles, it makes a loud, high sound.
If something such as the wind or a bullet whistles somewhere, it moves there, making a loud, high sound.
A whistle is a loud sound produced by air or steam being forced through a small opening, or by something moving quickly through the air.
A whistle is a small metal tube that you blow in order to produce a loud sound and attract someone's attention.
If you blow the whistle on someone, or on something secret or illegal, you tell another person, especially a person in authority, what is happening.
If you describe something as clean as a whistle, you mean that it is completely clean.