a peg on which to hang (something)

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a peg on which to hang (something)

Something that functions largely or primarily in service of expressing or presenting something else, often one's opinions, beliefs, or ideas (about something). It become clear from very early on that the director is using this adaptation as a peg on which to hang his own political agenda. The musical's plot is laughably thin, but most audiences will be willing to look past that given that the show is mostly a peg on which to hang catchy, upbeat song-and-dance numbers.
See also: hang, on, peg

a peg on which to hang something

If you use something as a peg on which to hang your ideas or opinions, you use it to introduce or draw attention to these ideas or opinions. He rarely discusses the book, using it as a peg on which to hang his opinions — and not necessarily those related to the book. These events give opposition spokesmen a peg on which to hang accusations of government mismanagement. Note: This expression can be used to show that the ideas or opinions are not directly relevant to the main subject being discussed.
See also: hang, on, peg, something