leave *something unfinished / have *something left to do / leave *something half done

cottage for Mt. Fuji climbers

drenching <shower> / <<rain>> driving / pouring

synonymous / synonym

clouds in the eastern sky

small bamboo thicket

walk on tiptoe / tiptoe

hide in ambush / lay in ambush / hide oneself / have [one's troops] lie in ambush / be in hiding

<<figurative>> cover *something up / conceal / hide / keep secret

stealthy / secret / furtive