Definition of a peg to hang something on in English:

a peg to hang something on

Something used as a pretext or occasion for the treatment of a wider subject: he is used as a peg on which to hang the intricate meshwork of diplomatic relations
See parent entry: peg

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily