Ha! Well I was just having a laugh. Expecting that you would prefer "you should damp your expectations" and that my construction should mean "make your expectations wet." And it turns out dampen is ambiguous. It means both moisten and dull, deaden, make weak.

Not only that, but most every form carries both meanings, and the "weaken" sense for the word damp predates the "humid" sense. Because the noun came first and it was specific to suffocating fumes in a mine that would extinguish candles, and people.

So my take now is that dampening means both "making weak" and "humidifying, moistening." Only damping is specific to motion/energy. And I can't recall encountering anyone using damping to mean "making wet."

Calm down there and dampen your expectations some. He was joking.

Oh, that makes sense. Usage creep bothers me, too. Especially the "literally" thing. I know gatekeeping is unpopular, and linguists will tut-tut you for being prescriptivist. But some language shifts are just fucking dumb and make people sound dumb.

This is literally the opposite of what happened. "To damp" was used to mean "to moisten" in the 1670s, a hundred and fifty years before "dampen" started to be used for it also in the early 1800s.

As with many if not most of the pedants in this thread, you're dying on a hill that's actually just straight-up wrong.