Equivocation rides on one word. Amphiboly rides on the grammar of a whole sentence.
Key idea
Amphiboly draws a conclusion from a sentence whose grammar allows two readings, using the reading its writer did not mean.
Why it works
Loose grammar can attach a phrase to the wrong word. "We sell dresses for girls with lace" means dresses with lace, but the grammar lets "with lace" attach to "girls." An argument built on the unintended reading starts from a premise nobody asserted.
Worked example: Two readings
"Ava saw the hiker with binoculars. So the hiker had binoculars."
- Reading 1: Ava used binoculars to see the hiker.
- Reading 2: the hiker was carrying binoculars.
- The conclusion picks reading 2 with no reason.
Answer: Amphiboly.
Worked example: Word or grammar?
"The menu said: 'Free soup and salad with any taco.' So the salad is free, but the soup costs money."
- No single word changes meaning.
- The question is whether "free" covers both items: a grammar question.
Answer: Amphiboly, not equivocation.
| Equivocation | Amphiboly |
|---|---|
| One word, two meanings ("light", "fan") | One sentence, two structures ("with binoculars") |
Common mistake
Confusing amphiboly with equivocation. In equivocation one word has two meanings; in amphiboly the sentence structure does. Ask: could I fix it by defining a word, or only by rearranging the sentence?