dwell on
US /dwel ɑːn/
UK /dwel ɑːn/
1.
くよくよ考える, 長々と話す
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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Don't dwell on your past mistakes; focus on the future.
過去の過ちをくよくよ考えるな。未来に集中しろ。
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She tends to dwell on negative thoughts.
彼女はネガティブな考えをくよくよ考える傾向がある。