I thought I'd make a thread where I'll periodically post various Japanese lessons. This'll most likely just be a word or phrase that I came across and found interesting.
Here's my first lesson!
油断 - "yudan" (sounds like "you done")
油 = oil
断 = to sever
油断 = negligence
As per Halpern's dictionary, this word comes out of an old tale of a monarch who made his retainer hold a pot of oil to test his concentration. If even one drop of the oil spilled, the retainer would be killed (have his life severed off). So, oil + sever came to mean negligence.

This word is actually used fairly often. Try to listen for it next time you watch Dragonball, for example (I'm looking at you, David
