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Classic usage
Reading level: medium
Estimated CEFR level: B1 — Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English sheltron, sheldtrume (“roof or wall formed by locked shields”), from Old English sċildtruma, sċyldtruma (“a phalanx, company (of troops), a tortoise, a covering, shed, shelter”, literally “shield-troop”), from sċyld, sċield (“shield”) + truma (“a troop of soldiers”). Cognate with Scots schilthrum, schiltrum. More at shield, and Old English trymman (“to strengthen”), from trum (“strong, firm”) at trim. Doublet of sheltron (a kind of military formation), which is the more conservative of the two.
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Classic usage
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