fish pond (artificially stocked); fishing pond
to remove obstacles in the way of one's objective; to take an indirect approach; (lit.) to fill in the outer moat
inner moat; moat within the castle walls
leaving someone behind; abandoning someone; marooning someone
digging deeply (below the surface); mining deep; probing deeply (issue, problem); investigating thoroughly; deepening relations
to be clear of obstacles in the way of one's objective
ascending trench or pathway cut into a naturally-occurring slope
kobori; swimming while wearing armor