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1. To continue in a manner that feels interminable or tedious. After Susie's presentation ground on for 45 minutes, the teacher finally told her to wrap it up.
2. slang To dance very closely to someone while using aggressive and overtly sexualized hip movements. In this usage, one of the participants is named after "on." If one more skeezy guy tries to grind on me, I'm out of here! Why would I go to a school dance? To watch all the cool kids grind on each other all night?
ground on (something)
To base or root something, usually a thought or belief, on something in particular; to use something as a foundation for something else. A noun or pronoun can be used between "ground" and "on." Not one of her accusations is grounded on reality! If he would only ground his decision-making on logic, he would save himself a lot of heartache.
ground something on something
Fig. to build a firm basis for something on something else. He grounded his thinking on his detailed research. His thinking was grounded on years of reading.