a round robin

round robin

1. In sports, a tournament in which all participants must face everyone else in successive turns. Hyphenated if used as a modifier before a noun. Because we had an odd number of teams, we decided to make the tournament a round robin. There will be four round-robin competitions, with the winner of each one going into a final bracket on Sunday.
2. A document signed in a circle around the edges to mask the order of the signatures (so that a leader of the message cannot be identified). Employees opposing the move have decided to send a round robin to management outlining their protest.
See also: robin, round
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

a ˌround ˈrobin

a letter of protest, etc. that has been signed by many people in such a way that no single person can be blamed or punished for sending it: Did you sign that round robin that was sent to the manager this week?This comes from the navy. Originally it was a letter of protest in which the signatures were written in a circle so that nobody could see who had signed it first.
See also: robin, round
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
A round robin for this type of grating would provide a useful check.
NIST not only contributed measurements as a round robin member but also analyzed the data deviations among all of the laboratories for IUPAC.