The story
- Middle English · derived fromcrak“loud conversation, bragging talk”
- English · derived fromcrack
- Irish · derived fromcraic
- English todaycraic killer
From craic (borrowed from Irish craic, itself borrowed from Northern English crack, inherited from Middle English crak (“loud conversation, bragging talk”)) + killer.
Words from the same roots
Middle Englishcrak all →
crakeCrathornewhat's cracking
Etymology from Wiktionary, CC BY-SA 4.0.