: a group of two successive letters whose phonetic value is a single sound (such as ea in bread or ng in sing) or whose value is not the sum of a value borne by each in other occurrences (such as ch in chin where the value is \t\ + \sh\)
Recent Examples on the WebTo construct a vowel progression theme, the constructor develops a set of phrases in which the last word of each entry starts with the same letter or digraph — in this case, PR — and ends with one of the vowel sounds.New York Times, 24 July 2022