Meltdown/ˈmeltdaʊn/ Definition 1 of 3Pro Tip 1/3Rapid Decline Denotes a quick deterioration in performance or condition. The team faced a meltdown during the final quarter. Pro Tip 2/3Intense Emotions Used to express an overwhelming display of emotions, usually negative. Unable to handle the stress, she experienced an emotional meltdown. Pro Tip 3/3Avoid Understatement Utilized for severe situations, not minor inconveniences. The market's response was not just a drop; it was a meltdown.