An obstruction or something that prevents movement or flow through a passage or channel.
From 'block' (an obstacle or wooden cube) + suffix '-age' (condition or state of). Block itself comes from Old French 'bloc' (log or chunk), ultimately from Germanic roots. The '-age' suffix creates nouns describing conditions or actions.
The suffix '-age' is incredibly productive in English—it turns verbs and nouns into states of being. Blockage, storage, leakage, damage—they're all describing 'the state of being [blocked/stored/leaked/damaged]'!
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