Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sombre is an adjective meaning "lacking brightness or color; dull". It carries 2 recorded senses.
grave or even gloomy in character
“solemn and mournful music”
“a suit of somber black”
“a somber mood”
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 sombre come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.