Green’s Dictionary of Slang

chop v.5

(Aus.)

to share, to divide up, to exchange.

[UK]W. Cobbett Rural Rides I 117: Lord Castlereagh [...] was accused of making a swap, as the horse-jockeys call it, of a writer-ship against a seat. It is barter, truck, change, dicker, as the Yankees call it, but as our horse-jockeys call it swap, or chop.
[UK]‘The City Youth’ in Out-and-Outer in Spedding & Watt (eds) Bawdy Songbooks (2011) IV 140: The traps they buff it home the forty for to chop.
[UK]‘Paul Pry’ Oddities of London Life I 178: I axed you to chop three bishops for the Russian ambassador.
[UK]C.S. Calverley ‘The Cock and The Bull’ Works (1901) 111: By way o’ chop, barter or exchange – / ‘Chop’ was my snickering dandiprat’s own term.
[Aus]W.H. Downing Digger Dialects 16: chop — Share. ‘To hop in for one’s chop’ — to enter in, in order to secure a privilege or benefit.
[Aus]G.H. Lawson Dict. of Aus. Words And Terms 🌐 CHOP – To exchange articles; to divide.
[US]L. Berney Whiplash River [ebook] ‘Your plan is we chop the pot three ways’.

In phrases

chop in (v.)

(Aus.) to join (i.e. a conversation), to interfere .

[T. Chaloner (trans.) Erasmus Praise of Folie (1509) 94: Courtiers? these minion gaibeseen gentilmen [. . .] haue learned the phrase of courte speche, at euery woorde to choppe in these goodly titles of honour, your noble grace, your royall hieghnesse, your excellent maiestee].
[Aus](con. WWI) A.G. Pretty Gloss. of Sl. [...] in the A.I.F. 1921–1924 (rev. t/s) n.p.: chop-in. Take a part, interfere.
[Aus]J. Byrell Lairs, Urgers & Coat-Tuggers 198: Brucie The Rooster chopped in.