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A can or bottle opener having a usually triangular head.
[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.]
(Tools) US a device with a triangular point at one end for making holes in the tops of cans
a small metal can opener for punching holes in the top of a beverage can, as of beer.
church key- Started out as slang for bottle opener in the early 1950s and was considered mildly shocking, even sacrilegious.
See also related terms for shocking.