BUR #26540 has been rejected.
create alias grinding -> grinding_(sexual)
create alias grinding_(skating) -> sliding
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1. reduce (something) to small particles or powder by crushing it.
"grind some black pepper over the salad"
sharpen, smooth, or produce (something) by crushing or by friction.
"power from a waterwheel was used to grind cutlery"
sandpaper
operate (a mill or machine) by turning the handle.
"she was grinding a coffee mill"
(of a mill or machine) work with a crushing action.
"the old mill was grinding again"
2.
rub or cause to rub together gratingly.
"mountain ranges developed along fault lines where tectonic plates ground against one another"
move noisily and laboriously.
"the truck was grinding slowly up the hill"
3.
(informal) (of a dancer) gyrate the hips erotically.
"there were sweaty bodies everywhere bumping and grinding to the music"
Second one has been added because of its wiki, but I'm really unsure about it, mainly because there is no tag for that. And sliding skateboard isn't that obvious, because there are artworks such as post #6716918.
Not sure if sharpening should also get an utility alias.