: To undergo an emotional or mental breakdown due to severe strain or stress.
: "He started cracking up during the meeting" (he began laughing uncontrollably).
The most common idiomatic use is in the phrase This refers to something that has been praised or "hyped up" but fails to live up to its reputation. Meaning : To be asserted as good, favorable, or legendary. Cracked Up Meaning
Alternatively, the phrase can have a much more serious tone, referring to a loss of control under pressure.
In a modern, informal context, "cracking up" describes an intense reaction to something funny. : To undergo an emotional or mental breakdown
: It can also describe a physical collapse or the breaking of an object into many pieces.
: You might use this for a restaurant that everyone recommends but that you find underwhelming. Meaning : To be asserted as good, favorable, or legendary
: "That comedian really cracks me up" (he makes me laugh a lot). 3. Mental and Physical Breakdown