Sound & Diction
Solecism
A departure from the grammatical conventions expected in a context. A writer may use one deliberately to characterize a voice; a dialect has its own conventions and is not inherently erroneous.
"You don't know about me without you have read a book…" — Huck Finn
Don't confuse it with. An accidental solecism is just an error; the device requires the wrongness to be chosen and characterizing. Enallage is the classical name for expressive grammatical substitution.
Examples
“We was ready,” the fictional narrator says.
The subject–verb agreement departs from standard written English to characterize a voice; it is not a judgment about a dialect’s worth.
The rest of the family
Alliteration Assonance Onomatopoeia Tmesis Neologism Archaism Epithet