oy diphth

Core Rule

oy represents a stable English diphthong pronounced /ɔɪ/, moving from a rounded back vowel toward a tense front vowel. It commonly appears at the end of syllables or words and follows a highly consistent phonics pattern.

Articulation Guide

Begin with the tongue slightly back and lips rounded (aw-like). Glide smoothly forward as the lips relax and spread slightly, ending with a brief ee-like position. Airflow remains continuous.

Word Analysis

In cowboy, the oy in boy clearly shows /ɔɪ/. deploy keeps the same glide in ploy. enjoyable highlights the diphthong strongly in the stressed syllable joy.

Pitfalls

Do not flatten oy into a pure /o/ sound, and avoid confusing it with oi spelling rules, which share sound but differ in position.