To indulge.
1. To put under water; to plunge. 2. To cover or overflow with water; to inundate; to flood; to drown. I would thou didst, So half my Egypt were submerged. Shak. To plunge into water or other fluid; to be buried or covered, as by a fluid; to be merged; hence, to be completely included. Some say swallows submerge in ponds. Gent. Mag.