The whole idea of a euphemism is that you are replacing a description of something unpleasant with a description of something harmless. I think almost any phrase used as a euphemism is ambiguous in the sense that, if taken out of context, one could not be sure if it was being used literally or as a euphemism.
Think of other euphemisms. For example, we sometimes say a person "bought the farm" meaning that he died. But if you told me, "My brother always wanted to move to the country, and yesterday he finally bought the farm," I think I'd take it that you meant that he literally purchased a place for growing crops. We say two people "slept together" as a euphemism for having sexual relations. But if a mother says, "The baby has been sick so last night I slept with him to keep him quiet", I don't think I'd interpret that sexually. Etc etc.
I recall when I was a little boy we went on a family vacation and my father said that he was going to "see a man about a horse". I was all excited that we were going to go horseback riding ... until my mother explained that this was a euphemism for using a toilet.