noun
A word used to identify a person, place, thing, or idea. In this case, 'police whistle' is a noun referring to a whistle used by police officers.
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The police whistle alerted nearby officers of the unfolding situation.
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I heard the police whistle and knew something was going down.
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When the police whistle blew, we knew it was time to scram.
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The sound of the police whistle pierced the silence like a sharp blade.