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buddy system

noun
  1. (in swimming and scuba diving) the practice of pairing swimmers, each being responsible for the other's safety.
  2. any arrangement whereby two or more persons, teams, etc., watch out for each other, as with mountain climbers.
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Origin of buddy system

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018