I had to look it up, and could find "top water" only in the GardenWeb Glossary of Botanical Terms:

To pour water into the top of a houseplant or other container; this may be merely enough to replenish moisture, or may be in copious quantities to dissolve and carry out salt buildup on the top of the soil.

I feel soooo much better now. Thanks P for that bit of aqueous recognition.

I'll try another one.

41S - sail, as on a boat in the water

72Round

You got a water-related one, Cue!

Redz, good one!

65 Billing

And that tops them off!