verb
to think, speak, or write at length about (a particular subject, especially one that is a source of unhappiness, anxiety, or dissatisfaction)
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It is not productive to dwell on past mistakes in a professional setting.
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Don't dwell on what happened, just move on and focus on the present.
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Stop dwelling on it, it's not worth your time and energy.
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His mind tends to dwell on negative thoughts, preventing him from enjoying the present moment.