On the subject of idioms ...

In Meghean it's considered nifty and sophisticated to refer to abstract concepts
by mentioning two related concrete things instead. So, one might say _conich oa
teoa_ "spear and fire" for "war", or _inde oa mañha_ "coin and ship" for trade.

Is there a name for this sort of idiom? It's a case of pars pro toto (partes pro
toto?), but is there something more specific?

                                                Andreas

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