Downswing rhymes with:
forewing, leftwing, rightwing, anything, everything, forewing, frederking, goldring, hamstring, leftwing, manring, offspring, plaything, rightwing, shoestring, snorkeling, speedring, stoneking, wellspring, willenbring, woodring
Downswing sounds like:
damaging, dancing, dehumanizing, demagoguing, demjanjuk, demjanjuk's, demonizing, denison's, denizens, denkins, denouncing, dimensions, diminishing, dinkins, dinkins', dominicans, doomsaying, downsizing, downsizings, duensing, dungeons