Is 解决 a common euphemism for going to the bathroom? In the novel 《天机》, passengers on a bus become ill after eating an unfamiliar dish. They ask the driver to stop the bus, and the male passengers, including the protagonist 叶萧, descend: 


  【他们】六七个男人都纷纷下车了。叶萧走在后面，他同样也感到腹痛难忍，虽然在露天解决十分不雅，但实在是忍受不了。男人们纷纷冲到小树林里，各自找了一小块空地解决。


A few lines later, the women join in:


  一个三十多岁的女人站起来说：“我们还是先下车解决掉吧。”


Later, there is another reference to the uncomfortable women, the “刚才露天解决的女士们。”

It seems clear to me that 解决 in the above excerpts is used as a euphemism for going to the bathroom (or, perhaps, for vomiting, but I suspect the former). The sense is clear enough, but I haven't heard this usage before.

Is 解决 a common euphemism for going to the bathroom, or is its use here justified solely by context?
The real meaning of the word is solving an issue/problem/conflict. The first context is going to the bathroom, second one sounds more like a solving a conflict, the word 解决 is not that common to use for going to bathroom, the word '方便' probably more common.