Green’s Dictionary of Slang

1. (Aus.) a door-to-door appeal for charity or similar collection.

1958		Sun (Melbourne) 27 May 17/1: All set for ‘Campaign Door-knock’ [...] With the Lord Mayor [...] are some of the girls who helped pack kits for Anti-Cancer Campaign collectors [AND].
1963		War Cry (Melbourne) 7 Dec. 5/5: Divisions three and four channelled their interests into the door-knock [AND].
1979		Mercury (Hobart) 5 July 5/3: The climax of the appeal is a doorknock held this Sunday [AND].

2. attrib. use of sense 1.

1971		Bulletin (Sydney) 2 Jan. 4/2: They are not over-enthusiastic about ‘special’ doorknock days.
1984		Canberra Times 26 July 18/4: The doorknock appeal on Sunday will see teams in all suburbs [AND].
2002		Animal Protection Soc. (WA) 🌐 We also have a regular door-knock collection, an annual street appeal and open days at least twice a year.