2 noun
1 [countable usually plural, uncountable] sadness that you feel about something, especially because you wish it had not happened
regret about
I have no regrets about leaving.
great/deep regret
She has already expressed deep regret for what happened.
with regret
I decided with some regret that it was time to move on.
It is with great regret that I must decline your offer.
to somebody's regret
I lost touch with her, much to my regret.

give/send your regrets

formal to say that you are unable to go to a meeting, accept an invitation etc:
My father was ill and had to send his regrets.

Dictionary results for "regret"
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