Hot answers tagged etymology
I looked up in my etymology dictionary (小学館's 日本語源大辞典) :) The answer goes like this: つくも was originally a name of a kind of plant (modern standard name: フトイ; English name is softstem bulrush or great bulrush according to Wikipedia). A compound word つくもがみ < つくも + かみ "disheveled white hair (especially of old women)" was coined, because of its ...
I think it means to vent the anger in the 8 compass directions. I.e. you are so angry that the effects reach every direction around you. Consider 四方八方. It refers to all sides or everywhere. I think 八つ refers to the 八方 part
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