Sloshing rhymes with:
squashing, washing, abolishing, accomplishing, admonishing, ambushing, anguishing, astonishing, banishing, bashing, blushing, brainwashing, brandishing, brushing, caching, cashing, cherishing, clashing, crashing, crushing, cushing, dashing, demolishing, diminishing, dishing, dishwashing, distinguishing, embellishing, enmeshing, establishing, extinguishing, fasching, finishing, fishing, flashing, flourishing, flushing, furbishing, furnishing, gnashing, gushing, hashing, impoverishing, languishing, lashing, lavishing, meshing, nourishing, onrushing, overfishing, perishing, pershing, photofinishing, polishing, publishing, punishing, pushing, quashing, ravishing, reestablishing, refinishing, refreshing, refurbishing, rehashing, relinquishing, relishing, replenishing, rushing, skirmishing, slashing, smashing, smoshing, splashing, squashing, stashing, tarnishing, thrashing, trashing, unleashing, vanishing, washing, wishing
Sloshing sounds like:
salesman's, salesmen's, silicones, siliconix, slackening, slackens, slackness, slashing, slicing, slocan's, slogans, slogging, slouching, slugging, sluggishness, sluicing, socializing, squelching, sulking