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.