Taṇhā: Craving
Craving is thirst, and thirst wanders the waterless waste for water that is not there. The spirit finds no rest in the dry places because its nature is to keep seeking, and seeking can never settle into rest, so it turns back toward the one house it knows. A defilement pushed out by force still thirsts, and thirst always circles home.
Anusaya: The underlying tendency
An underlying tendency is the root a habit leaves behind. The spirit returns to "my house" because it was swept out but never dug up, the way a weed cut at the ground keeps its root in the soil and greens again after the first rain. Clean floor, living root: that is why the old trouble finds its way back.
Pamāda: Heedlessness
Heedlessness is dropping your guard. The house stands empty, swept, and set in order, which looks like safety and is the danger, because a clean room with no one watching the door is the easiest room to walk back into. Sweeping the floor was the small work; staying awake in the room was the work left undone, so the place sat open.
Āsava: The inflowing taints
The taints are what pour into an unguarded mind. With the door left open they enter the way floodwater fills a low room, and the seven that move in are worse than the one that left, so the swept house ends up more crowded than before. They come to settle, and "dwell" means they take the place as their own.
Kamma: Action and its fruit
Action carries its own result forward. The last state is worse than the first because every return trains the pattern deeper, the way a footpath through grass wears lower and easier to follow each time it is walked. "Worse" is not bad luck, it is the ripening of a groove cut again and again until the feet find it on their own.