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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English borowe, borewe, borwȝ, burȝe, burh, burye (“refuge for an animal, lair, burrow”), apparently a variant of Middle English burgh (“fortified dwelling, stronghold, refuge”) (see borough) and thus from Old English burh, from Proto-West Germanic *burg, from Proto-Germanic *burgz (“stronghold, city”), from Proto-Indo-European *bʰerǵʰ- (“high”), but this sense is not known in Old English burh. Compare, however, Dutch cognate burcht, which has a similar sense. It may be related to bury (“to dig”), in which case it would be derived from Proto-Indo-European *bʰergʰ- (“to protect, defend, save, preserve”).
tunnel
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Classic usage
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