An archaic plural or variant form, possibly referring to curtains, courtesan-related terms, or shortened items (exact meaning uncertain in historical texts).
Likely a plural variant of curtay or a dialectal form influenced by Old French cortai or cortoise. The exact etymology is obscure due to limited documented usage.
Some words in English become so rare that lexicographers literally can't find enough historical examples to be certain what they meant—curtays is one of those mysterious words that appears once or twice and then vanishes!
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