these things happen phrase
used for telling someone not to be upset about something unpleasant that has happened or something bad that they have done
Thesaurus: ways of telling someone not to worry or be upsetsynonym
Main entry: happen
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ˌthese things ˈhappen idiom
used to tell sb not to worry about sth they have done
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‘Sorry— I've spilt some wine.’ ‘Never mind. These things happen.’
Useful english dictionary. 2012.