The phrase "deep bathtub" means a bathtub that is designed to be deeper than normal, allowing you to submerge your body more fully when taking a bath. Full definition
Special touches that accentuate the feel of Polynesia include striking works of art, private pools and sliding doors by deep bathtubs for panoramic fresh - air views of the lagoon. (theluxurytravelexpert.com)
In addition to the quirks Joe DeMatio mentioned, the high beltline found in all large Ford vehicles gives the sensation that you're sitting in a very deep bathtub and just barely peering over the edge. (automobilemag.com)
«His and hers» sinks and inviting deep bathtubs complete the indulgent feel of these rooms. (luxuryretreats.com)