Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
downward-sloping is an adjective meaning "sloping down rather steeply". It carries one recorded sense.
sloping down rather steeply
Definitions, synonyms and semantic relations for downward-sloping come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.