to keep thinking or talking about something, especially something bad or unpleasantفکر کردن یا صحبت کردن مدام درباره چیزی، بویژه چیز بد یا ناخوشایند
In his speech, he dwelt on the plight of the sick and the hungry.
... [مشاهده متن کامل]
Let’s not dwell on the past", she said"
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https://dictionary. cambridge. org/dictionary/english/dwell - on?q=dwell on something