skeleton key
  萬能鑰匙
  Skel·e·ton, a. Consisting of, or resembling, a skeleton; consisting merely of the framework or outlines; having only certain leading features of anything; as, a skeleton sermon; a skeleton crystal.
  Skeleton bill, a bill or draft made out in blank as to the amount or payee, but signed by the acceptor. [Eng.]
  Skeleton key, a key with nearly the whole substance of the web filed away, to adapt it to avoid the wards of a lock; a master key; -- used for opening locks to which it has not been especially fitted.
  Skeleton leaf, a leaf from which the pulpy part has been removed by chemical means, the fibrous part alone remaining.
  Skeleton proof, a proof of a print or engraving, with the inscription outlined in hair strokes only, such proofs being taken before the engraving is finished.
  Skeleton regiment, a regiment which has its complement of officers, but in which there are few enlisted men.
  Skeleton shrimp Zool., a small crustacean of the genus Caprella. See Illust. under Laemodipoda.
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  skeleton key
       n : a passkey with much of the bit filed away so that it can
           open different locks