noun - A warning or warning whistle is a caution given by the head referee or assistant referees during an open water swimming competition due to any kind of physicality or impeding of one athlete by another. A warning is a lessor violation of the rules than a yellow card (or yellow flag) or a red card which are more serious violations.
The head referee gave numerous warnings to the swimmer who cut across the back of his competitor.
Warning Whistles and Yellow Card
Head referee Sid Cassidy giving out warning whistles and yellow cards during a USA Swimming National Open Water Swimming Championships in Fort Myers, Florida
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