late 14c., originally medical, from Latin ruptura "the breaking (of an arm or leg), fracture," from past participle stem of rumpere "to break," from a nasalized form of the PIE root *reup- "to snatch" (see rip (v.)). Specifically as "abdominal hernia" from early 15c.
1739, from rupture (n.). Related: Ruptured; rupturing. Ruptured duck (1945) was U.S. GI's dismissive term (based on its design) for the discharge button they were awarded.
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