IPA: /ˈkoʊlˌbɪn/
KK: /ˈkoʊlˌbɪn/
A container used to store coal.
The workers filled the coalbin with fresh coal for the winter.
Coalbin → The word is formed from "coal" (from Old English *cal, meaning a black substance used as fuel) and "bin" (from Old English *binn, meaning a receptacle or container). A coalbin is a container specifically designed to hold coal.
Think of a 'black substance' ('coal') stored in a 'container' ('bin') — that's what a coalbin is.