noun

• (uncountable, British, slang, obsolete) Copper; items made of copper.
  "The sewer-hunters were formerly, and indeed are still, called by the name of "Toshers," the articles which they pick up in the course of their wanderings along shore being known among themselves by the general term "tosh," a word more particularly applied by them to anything made of copper."
• (uncountable, chiefly British, slang, rare) Valuables retrieved from drains and sewers.
  "I am present engaged in fishing for tosh in the sewers of Blastburn."
• (chiefly British, slang, uncountable) Rubbish, trash, (now especially) nonsense, bosh, balderdash
  "To think what I've gone through to hear that man! Frightful tosh it'll be, too."
• (UK, archaic school slang, countable) A bath or foot pan
  "A ‘tosh’ pan... is also provided."

verb

• (British, obsolete slang) To steal copper, particularly from ship hulls
  "Toshing, a cant word for stealing copper sheathing from vessels' bottoms, or from dock-yard stores."
• (chiefly British, uncommon slang) To search for valuables in sewers
  "You tend to the toshing, let Mester Hobday tend to the dealing."
• (UK, archaic school slang) To use a tosh-pan, either to wash, to splash, or to "bath"
  "‘Toshing’ was the name given to a punishment inflicted by the cadets on any one of their number who made himself obnoxious. The victim, dressed in full uniform, was forced to run the gauntlet of his brother cadets, who, as he passed, emptied the contents of their ‘tosh-cans’ (small baths holding about three gallons of water) over the wretched lad's head."

adj

• (Scotland, obsolete) Tight.
  "Tosh, tight, neat."
• (Scotland) Neat, clean; tidy, trim.
  "I gang ay fou clean and fou tosh As a' the neighbours can tell."
• (Scotland) Comfortable, agreeable; friendly, intimate.
  "We were a very tosh and agreeable company."

adv

• (Scotland) Toshly: neatly, tidily
  "Shouther your arms!—O! had them tosh on, And not athraw!"