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In a modern, informal context, "cracking up" describes an intense reaction to something funny.

: This use of "crack up" to mean "to praise" dates back to the early 1800s. 2. Humor and Laughter

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.

: "That comedian really cracks me up" (he makes me laugh a lot). 3. Mental and Physical Breakdown

: You might use this for a restaurant that everyone recommends but that you find underwhelming.