gravel / a magistrate's office for adjudicating issues from commoners (from the rock gardens that were common at these during the Edo period) / rice (either cooked or as raw grains)

(historical) a person trained in the art of stealth, acting as a spy, saboteur, and/or assassin

many a mickle makes a muckle, small things together become a large thing; literally dust, if piled up, becomes a mountain

to be full of; to hold a large amount of