bulwark
C2CEFR level
60/100Rarity: rare
FormalRegister
General noun
A defensive wall, or anything serving as a strong protection or defence.
The mountain range formed a natural bulwark against invasion from the north.
Business noun
A defensive strength that protects a firm against competitive threats.
Patents on the core molecule served as a bulwark against generic entrants for another eight years.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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