blue murder

1. 1.

   an extravagantly loud outcry

   “she screamed blue murder”

   Broadercry

Questions about blue murder

What does blue murder mean?

blue murder means "an extravagantly loud outcry".

Is blue murder a common word?

blue murder is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.