(eplain.info)\expandonce

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7.6.5 '\expandonce'
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'\expandonce' is defined as '\expandafter\noexpand'. Thus, '\expandonce
TOKEN' expands TOKEN once, instead of to TeX primitives. This is most
useful in an '\edef'.

   For example, the following defines '\temp' to be '\foo', not 'abc'.

     \def\foo{abc}
     \def\bar{\foo}
     \edef\temp{\expandonce\bar}