| Date: | 1400-1500 |
| Language: | Old French |
| Origin: | regreter |
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re‧gret1
past tense and past participle regretted, present participle regretting [transitive]
past tense and past participle regretted, present participle regretting [transitive]1 to feel sorry about something you have done and wish you had not done it :
I've never regretted the decision.
Don't do anything you might regret.
I've never regretted the decision.
Don't do anything you might regret.2 [not in progressive] formal used in official letters or statements when saying that you are sorry or sad about something :
We regret any inconvenience caused to our customers.
We regret any inconvenience caused to our customers. regret (that)
I regret that I will be unable to attend.
I regret that I will be unable to attend.WORD CHOICE: 
regret, be sorryRegret is very formal when it is used to apologize • I deeply regret causing you offence. It is more usual to say you are sorry • I'm sorry if I hurt your feelings. If you regret doing something, you wish you had not done it • Do you regret resigning from your job? • I asked him to join us, then regretted it. You can say you are sorry about something that you wish you had not done, or something that is not your fault • I was sorry that she decided not to come back. You can say that you are sorry to say something or regret to say something before giving bad news • I am sorry to tell you that you failed the test. • We regret to inform you that no trains will run today.

regret, be sorryRegret is very formal when it is used to apologize • I deeply regret causing you offence. It is more usual to say you are sorry • I'm sorry if I hurt your feelings. If you regret doing something, you wish you had not done it • Do you regret resigning from your job? • I asked him to join us, then regretted it. You can say you are sorry about something that you wish you had not done, or something that is not your fault • I was sorry that she decided not to come back. You can say that you are sorry to say something or regret to say something before giving bad news • I am sorry to tell you that you failed the test. • We regret to inform you that no trains will run today.
