noun
a group of birds or animals that are gathered together
preposition
a word that shows the relationship between a noun or pronoun and other words in a sentence, in this case, 'to' indicates the direction or destination of the flock
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Tourists from all over the world flock to the historic city to admire its architecture.
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People always flock to the new bakery in town because their pastries are amazing.
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Teenagers flock to the mall on weekends to hang out with their friends.
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Investors flock to the stock market when they hear about a new opportunity for high returns.