noun
A thumb is a short, thick digit on the hand that is opposable to the other four fingers.
preposition
Through is a preposition indicating movement from one side or end to another.
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I decided to thumb through the research articles to find relevant information for my thesis.
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I like to thumb through magazines at the doctor's office to pass the time.
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Let's thumb through this book and see if we can find any juicy gossip.
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She decided to thumb through her memories to find the answer to the question.