The under-sink refused to dry out, and kept coming up with more and more water even though I stopped using the side with the leaking drain. Today I found out why.
I couldn’t be satisfied with one leak. Oh, no. I had to have two—the drain, and a drip from the hot-water feed line, which seems to have electrolyzed in the way that hot-water pipes will. That one, being metal, I’m unwilling to tackle myself: this calls for a plumber, and that’s what I’ll have to do come Monday. Meantime, I have a huge sinkful of dishes that I expect I’ll have to do in M’s bathtub, since it’s the only one whose stopper works.