noun
a word that functions as the name of a specific person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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He would never whistle for a taxi, preferring to call ahead for a car service.
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If you need a ride, just whistle for a cab and one will pull over for you.
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I'll just whistle for an Uber to pick us up.
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She knew she couldn't just whistle for help in this situation, she had to take action herself.