oughtn't

ought n't |ˈôtnt ˈɔtnt | ▶contraction ought not.

oughtn't

oughtn't |ˈɔːt (ə )nt | ▶contraction ought not.

oughtn't

ought n't /ɔ́ːt (ə )nt /｟くだけて ｠ought notの短縮形 (→ought コーパスの窓 (2 )(a )).