Plural of bilbo; fine swords or blades from the Bilbao region of Spain, or a variant plural of bilboes (shackles).
From 'bilbo,' derived from Bilbao, Spain, famous in medieval times for exceptional sword and metalwork. The '-os' plural reflects Spanish influence while adapting to English.
In Shakespeare's time, a 'bilbo' was a status symbol—owning one meant you had connections to Spanish wealth and craftsmanship, and references to bilbos appear in his plays as markers of aristocratic quality.
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