A hinged or sliding door in a floor, ceiling, or stage that can be opened to provide access to a space above or below. A concealed entrance or exit.
Compound word from 'trap' (from Old English træppe meaning 'snare') and 'door.' The combination emerged in the 16th century, originally describing doors used to catch or confine someone, later extending to any concealed horizontal door.
Trapdoors capture our fascination with hidden passages and secret escapes - they appear in everything from medieval castles to magic shows to computer security (where 'trapdoor functions' are easy to compute one way but nearly impossible to reverse). The word embodies the thrilling possibility that any ordinary floor might conceal an extraordinary secret.
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