Here's why:
* Sound Imitation: The word "whistle" mimics the sound produced by blowing air through a narrow opening, like a whistle.
* Direct Connection: The spelling and pronunciation of the word directly reflect the sound it represents.
However, it's worth noting that the actual sound of a whistle can vary depending on the type of whistle and how it's blown. While "whistle" captures a general sense of the sound, it's not a perfect representation of every specific whistle sound.