Contraction meaning 'should not'; expressing something that is not recommended or is wrong to do.
Modern contraction combining 'should' (from Old English 'sceolde') and 'not,' with the 'o' dropped. Contractions became standard written English around the 1800s.
English contractions like 'shouldn't' are actually quite old in spoken language, but we only started writing them down regularly when writing became more conversational!
Complete word intelligence in one call. Free tier — 50 lookups/day.