1re·gret 
/rɪˈgrɛt/ verb
re·grets; re·gret·ted; re·gret·ting /rɪˈgrɛt/ verb [+ obj] 1 : to feel sad or sorry about (something that you did or did not do) : to have regrets about (something)
▪ Don't say anything you might regret later. ▪ I deeply regret what I said. ▪ She does not regret leaving him. ▪ He regrets not traveling more when he was younger. ▪ He says he doesn't regret anything that he's done in his life. ▪ If you don't travel now, you might live to regret it. [=you might feel sorry or disappointed about it in the future] 2 not used in progressive tenses — used formally and in writing to express sad feelings about something that is disappointing or unpleasant ▪ We regret to inform you [=we are sorry to tell you] that we have offered the job to someone else. ▪ We regret any inconvenience these delays may cause. ▪ Dr. Smith regrets that she will be unable to attend. [=Dr. Smith cannot attend] ▪ It is to be regretted [=it is regrettable/unfortunate] that the program has lost its funding.
▪ Don't say anything you might regret later. ▪ I deeply regret what I said. ▪ She does not regret leaving him. ▪ He regrets not traveling more when he was younger. ▪ He says he doesn't regret anything that he's done in his life. ▪ If you don't travel now, you might live to regret it. [=you might feel sorry or disappointed about it in the future]
