a) if a vehicle grinds to a halt, it stops gradually:
Traffic ground to a halt as it approached the accident site.
b) if a country, organization, or process grinds to a halt, its activity or the process gradually stops:
After two days the talks had ground to a halt.
perform a movement
to perform a special movement in skateboarding or rollerblading, which involves moving sideways along the edge of something, so that the bar connecting the wheels of the skateboard orrollerblade presses hard against the edge