Things that clog up or prevent movement or flow through a passage, like when a pipe gets stuck with debris.
From 'block' (Old English 'bloc') plus '-age' suffix (denoting a process or state). The '-age' ending comes from Old French and Latin '-aticum', used to create nouns from verbs.
Heart blockages kill more people worldwide than almost any other single cause—they're why doctors invented stents and balloons that inflate inside arteries to reopen clogged vessels.
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