Grind: the energy of taking in, manifested in the act of chewing hard substances to powder by crushing, biting and grinding force. Grinding power is the precursor to eating, swallowing, devouring and, perhaps, spewing forth again (What has passed through grinding energy is ground.) It is a rhythmic, wave energy, at one with oceans and the rotations of days, nights, moons and seasons.
Gravel and Sand Bar, Fraser River