To become very or unreasonably angry or upset; to have an outburst of rage, frustration, or ill temper. My mom's going to have a conniption fit when she sees what happened to the car!I was so embarrassed when Danny started having a conniption fit in the grocery store.There's no need to have a conniption fit about this, Eleanor—we'll figure something out.
Display hysteria; an extreme emotional upset. This term dates from the early 1800s. Seba Smith had it in Major T. Downing (1860), “And Keziah fell down in a conniption fit.” The phrase has a rustic sound and is heard less often today.
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