1.(舞台等的)地板门,活板门,坠门;(房顶的)天窗;【矿】通气门;(衣服等的)钩破缝
1.a small door that covers an opening in a floor, ceiling, or wall
1.Old medieval dungeons had trapdoors laid underneath stones.
早先中世纪地牢的石头地面下都有暗门。