Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
over-the-hill is an adjective meaning "too old to be useful". It carries one recorded sense.
too old to be useful
“He left the house...for the support of twelve superannuated wool carders”
Definitions, synonyms and semantic relations for over-the-hill come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.