Drop in the sea

• Shallow period
• Cyclic recession
• Time when the water's low
• The tide while water is flowing out
• Good time to collect seashells
• Broadway composer Fred's laundry detergent of choice?
• It's on its way out
• When clams aren't so happy?
• Watery reflux

WordNet Word definitions in WordNet
n. the tide while water is flowing out [ant: flood tide ]