Related Clues:

• Slope downward
• Set, as the sun
• Succumb to quicksand
• Hole, as a putt
• Washing-up place
• Go down like a rock
• Pile-of-dishes place
• Dirty dishes collector
• Dig as for well
• Drop beneath the surface
• Fall to the bottom
• Plumbing fixture
• The sort of measure that might get round a horse
• This will never have you on the up and up at last at last
• It's wrong to start to go down the drain from this