shouldn't've

== English == === Etymology === From shouldn't + -'ve. === Pronunciation === (US) IPA(key): /ˈʃʊd(ə)n(t)ə(v)/ === Contraction === shouldn’t’ve (informal) Contraction of should +‎ not +‎ have. ==== Synonyms ==== shouldna (colloquial) === See also === couldn't've wouldn't've oughtn't've