Hot Wash

Yet another possibility is that the source is a more figurative use of “wash,” specifically in the sense found in the phrase “to come out in the wash,” which first appeared in print in the early 1900s meaning, according to the Oxford English Dictionary, “(of the truth) to be revealed, become clear; (of a situation, events, etc.) to be resolved or put right eventually.” The “wash” in “come out in the wash” is a metaphorical laundering process, and that figurative sense of “wash” may play a role in “hot wash.”

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