sacré bleuEnglishOxford New American Dictionarysacré bleu /ˌsäkrā ˈblə , ˌsɑkreɪ ˈblə / ▸ exclamation a French expression of surprise, exasperation, or dismay: Sacré bleu, you Scots speak most fantastic French. – ORIGIN alteration of sacré Dieu ‘holy God’.