哨 shào has 口 mouth as meaning part and 肖 xiào as sound part. It first meant a crooked mouth. From that came whistling or chirping, and then a sentry, one who whistles.
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Example Sentences
他吹响了哨子，比赛开始了。
tāchuīxiǎngleshàozǐ ， bǐsàikāishǐle 。
He blew the whistle, and the game started.
在军队里，哨兵负责守卫。
zàijūnduìlǐ ， shàobīngfùzéshǒuwèi 。
In the army, the sentry is responsible for guarding.