Dead low water refers to the stage of low tide where the water level is at its lowest point. Other synonyms that can be used to refer to this stage of low tide include low water mark, low tide, low-water line, low tide level. These synonyms all describe the moment when the water has receded and the beach or shoreline is exposed. Dead low water is a crucial time for activities like beachcombing and shell collecting, as certain marine creatures may be visible during this time. It is important to note that the level of dead low water can vary depending on factors like the phase of the moon and the geographic location.