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choco

choco Austral. slang.
  (ˈtʃɒkəʊ)
  Also chocko.
  [Abbrev. of chocolate soldier (see below).]
  A militiaman or conscripted soldier.

[1919 Downing Digger Dial. 16 Chocs, the 8th Brigade (‘Tivey's Chocolate Soldiers.’ Originally an abusive name; now an honourable appellation).] 1943 G. H. Johnston New Guinea Diary ii. 60, I told you we'd do something when we got stuck into 'em. Not bad for Chockos! 1943 Baker Austral. Slang (ed. 3) 20 Choco, a Militiaman. (War slang.) Chocolate soldier, as for ‘Choco’. 1955 A. Ross Australia 55 v. 64 Conscripts, known as ‘chocos’ (chocolate soldiers) were not required to serve outside prescribed areas. 1966 Sunday Truth 3 July 3/3 During the war against Japan..many of the Diggers were conscripts (chocos).

Oxford English Dictionary

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