say it: HAY-wahyr
haywire is an adjective and noun meaning "informal or slang terms for mentally irregular". It carries 3 recorded senses.
not functioning properly
“something is amiss”
“has gone completely haywire”
“something is wrong with the engine”
wire for tying up bales of hay
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for haywire come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.