Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
old-hat is an adjective meaning "repeated too often; overfamiliar through overuse". It carries 2 recorded senses.
repeated too often; overfamiliar through overuse
“bromidic sermons”
“his remarks were trite and commonplace”
“hackneyed phrases”
“a stock answer”
“repeating threadbare jokes”
“parroting some timeworn axiom”
“the trite metaphor `hard as nails'”
out of fashion
“a suit of rather antique appearance”
“demode (or outmoded) attire”
“outmoded ideas”
Definitions, synonyms and semantic relations for old-hat come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.