diphthong
noun C2
Plain meaning
a vowel sound that changes from one sound to another in the same syllable
Exam-register meaning
In formal or high-level texts, it is used to describe a vowel sound that changes from one sound to another in the same syllable, often with a precise or specialised tone.
In context
naturalThe article mentioned diphthong as one of the main issues.
examThe author examines diphthong in relation to social change, public policy, and institutional responsibility.
Common collocations
a clear diphthongevidence of diphthongwidespread diphthong
Watch out
Do not use “diphthong” as a vague high-level replacement; make sure the sentence really needs this specific noun.