Coalbin is a 7 letter English word. It's valid Scrabble word worth 11 points. It's valid Words with friends word worth 15 points.
You can make 200 anagrams from letters in coalbin (abcilno).
An Americanism dating back to 1860-65; coal + bin
I smile now as I recall that watermelon grin, when the darkey yawned like a coalbin in expression of his greeting.
There should be a window in the coalbin through which the coal can be put in.
If this is not possible, the next best thing is to have the coalbin enclosed, for the coal makes the worst of the cellar dirt.
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