grinding
A sex act in which a girl grinds her bare or covered pussy against her partner's penis without being penetrated.
This is different from imminent vaginal. In imminent vaginal, the penis is angled to penetrate, while in grinding, the pussy is simply rubbed against the penis with no apparent intention to penetrate.
For ass-to-penis rubbing, use buttjob instead.
For pussy-to-object rubbing, use crotch rub instead.
For pussy-on-thigh rubbing, use thigh straddling instead.
For pussy-to-pussy rubbing, use tribadism instead.
For penis-between-thigh rubbing, use thigh sex instead.
For clothed pussy-to-penis rubbing, use dry humping instead.
For rubbing against anything else, use frottage.
For the skateboarding move of grinding on rails, use sliding instead.