Church-key meaning

A can or bottle opener having a usually triangular head.
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A device for opening cans, esp. originally beer cans, by punching a V-shaped hole in the top.
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A can opener having a triangular tip that pierces the can.
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Origin of church-key

  • From the resemblance of the cap-gripping end of some bottle openers to the ornamental handles of large keys, such as those used to lock church doors

    From American Heritage Dictionary of the English Language, 5th Edition