A digraph is a pair of letters that makes one sound, as in ship, chat, and thin.

The longer version

Two letters combine to write a single sound that the Roman alphabet had no character for, so English pairs h with s, c and t to produce the hisses in ship, chat and thin. Each pair behaves as one unit: you cannot spell it with either letter alone and still get the same result.

Longer versions exist, as in the three-letter match used for the sound at the start of school or the watch-like ending in match. Other languages solve the same shortage with diacritics or with letters from their own stock. Readers usually learn these pairs as wholes, which is why breaking them apart feels wrong even though nothing marks the boundary.

Where this entry sits

This category gathers small surprises about the English language, from odd spelling rules to words that quietly hide their own history. Expect palindromes, punctuation oddities, borrowed terms, and the strange ways writing systems record spoken speech. The full list sits on the Words and Language page, where every entry is listed in order.