Sam2 asked 3 months ago: “Darchei Ha’emori? (about why it’s assur to take part in sporting events as a player) How do you get Darchei Ha’emori?”
I didn’t get to it. The rav of my shul at the time mentioned it a few years ago when someone in our neighborhood was caught having joined a bowling league. It refers to adopting goyish customs and culture even when they don’t involve avoda zora r”l, like slapping palms etc. I wouldn’t dredge this up now except that RSR Hirsch zt”l says much the same thing in his peirush on this week’s parsha, and no one thinks of him as NK, extremist, machmir, etc.