regret [rɪˈgrɛt]

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¹ regret verb

• to feel sad or sorry about (something that you did or did not do) : to have regrets about (something)
• —used formally and in writing to express sad feelings about something that is disappointing or unpleasant

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² regret noun

• a feeling of sadness or disappointment about something that you did or did not do
• a statement saying politely that you will not be able to go to a meeting, party, etc.