It seems that I am once again confused about the finer points of metonyms. The example I give my students is the phrase Today, Ottawa announced..., where Ottawa is a metonym for the Canadian government (because the two are closely-associated concepts).
But what about They went to the bedroom and had a good time? Is to have a good time a metonym for to have sex (aside from also being a euphemism)? Speaking of which—are euphemisms metonymic by definition (or at least a subset of metonymy)?
Also, I bought some sort of medicinal drink at Safeway yesterday and it's called "Hot Lemon Relief"—can relief be a metonym for (medicinal) drink?