Results

cant1
noun a bit 20-.
adjective little 20-. etymology: origin obscure but possibly a shortening of English scant; cant here seems to have no connection to the Cant language; collected by EMcC/PS; attested by BS in TDITA; possibly also found in Shelta note:

Attested by Canadian Paul Pope (2013) as cant ‘a little bit’.
Cant2, Kant noun the name Scottish Travellers give to the language they speak: Now my brother spoke a lot of Cant. Sandy was a great man for the Cant and he taught me a lot of the language. 18-. etymology: from Gaelic cainnt ‘speech’; form Kant attested in Shelta as ‘the Pavee dialect’; attested by JS and DW; defined by Grose and Egan (1823) as ‘the flash language’ for a further explanation of Flash and Cant respectively see below; also collected by Simson (1865) note:

Grose and Egan (1823) define flash as follows: Knowing. Understanding another’s meaning. The swell was flash, so I could not draw his fogle; [meaning] the gentleman saw what I was about, and therefore I could not pick his pocket of his silk handkerchief. To patter flash; to speak the flash language. Incidently, a dictionary entitled A new and comprehensive vocabulary of the flash language published in 1812 was written by a convict called James Hardy Vaux who was transported to Australia three times before disappearing into obscurity. His work is credited as being Australia’s first published dictionary.

OED defines Cant as follows: noun
4 The peculiar language or jargon of a class: a. The secret language or jargon used by gipsies, thieves, professional beggars, etc.; transf. any jargon used for the purpose of secrecy.

Simlarly, they define flash language as follows: Connected with or pertaining to the class of thieves, tramps, and prostitutes.
chant, cant noun a gill; a measure of beer or whisky 20. etymology: perhaps a development from Shelta tyant with the same meaning; attested by Galloway Tinkler-Gypsies