compern.
/ˈkɒmpə/, U.S. /ˈkɑmpər/ Chiefly British.
A person who habitually enters competitions (esp. those promoting consumer goods) in order to win as many prizes as possible.
ΚΠ
1987 Times 13 June 39/1 (headline) ‘Compers’ with better chances of winning.
1989 Austral. Post (Melbourne) 25 Nov. 28/1 Are you a dedicated ‘comper’ who sits up half the night, furiously trying to win everything from a year's supply of pet food to a trip to Disneyland.
1993 D. Moggach Ex-wives xxi. 237 All her friends at work were compers.
1998 BBC Top Gear Mag. Sept. 79/2 If you've always struggled over that tricky little tie-breaker, grab a copy of comper's bible Competitors Companion..for tips.
This is a new entry (OED Third Edition, December 2001; most recently modified version published online March 2022).
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n.1987