Linchpin
From The Art and Popular Culture Encyclopedia
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A linchpin or lynchpin is a metal part used in mechanical engineering to prevent a wheel or other rotating part from sliding off the axle it is riding on.
In colloquial speech, it is used to refer to the object at the center of a certain situation. An example of this is the main character in a sitcom, who acts as the glue that keeps all the other characters and situations together.
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Linchpin" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
