verb
to absorb or engross the mind completely; to occupy or distract someone beforehand or in advance
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Her work responsibilities often preoccupy her thoughts throughout the day.
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She can't stop thinking about her upcoming vacation, it's really preoccupying her mind.
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I'm so preoccupied with this new video game, I can't focus on anything else.
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The looming deadline preoccupies his mind like a dark cloud, causing stress and anxiety.