Hello there! Great question! The plural of "thief" is "thieves."
In English, nouns are usually made plural by adding an "s" or "es" to the end of the singular form. This is the case with "thief" as well. So, if you are talking about more than one person who steals, you would say "thieves."
For example, "The police caught two thieves breaking into the jewelry store last night."
It's important to know the correct plural form of words to make sure people understand what you are talking about. So, keep practicing and expanding your vocabulary!
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