noun

• (nautical, informal) A slow-moving craft.
  "But, with any ships in the Baltic Fleet that were worth sending - and some that probably weren't worth sending anyway - having already been dispatched, this gave him the perfect excuse to start rounding up old, obsolete vessels which had been rejected in the first place as being old tubs and designated by some of the less-kind officers as the "Sink-by-Themselves Squadron"."
• (humorous or derogatory) Any structure shaped like a tub, such as a certain old form of pulpit, a short broad boat, etc.
  "All being took up and busied, some in pulpits and some in tubs, in the grand work of preaching and holding forth."
• (mining) A box or bucket in which coal or ore is sent up a shaft.
• (obsolete) A sweating in a tub; a tub fast.
  "tubs and baths; bring down rose-cheeked youth To the tub-fast and the diet"

verb

• (transitive) To plant, set, or store in a tub.
  "to tub a plant"
• (ambitransitive) To bathe in a tub.
  "February 1, 1873, Meredith Townsend and Richard Holt Hutton (editors), "Change of Air and Scene", in The Spectator Don't we all "tub" in England?"