CIO
CIO definition by Slang.net - The Slang Dictionary
This page explains what the acronym "CIO" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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An acronym that stands for "cry it out" and commonly seen on parenting forums.
CIO is a baby sleep training method where the parents let their baby cry until he or she falls asleep. It is a controversial method as some parents argue that the method is neglectful.