the.com/dry sink

means An old-fashioned wash stand — a cabinet topped with a basin or metal-lined trough that holds water you poured in yourself, since there was no pipe to drain it away.

from Straightforward compound English: 'dry' because it had no running water or drain, 'sink' from Middle English sinken (to sink), extended by the 1500s to mean a basin for washing. Dry sinks were common farmhouse furniture before indoor plumbing — you'd haul water in a pitcher or bucket, use the basin, then empty it by hand. The name is just honest carpentry talk: it looks like a sink, acts like a sink, but stays dry on its own.