Meaning of 暗過去 in Japanese

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Definition of 暗過去

くらい(kurai) 【暗い ·昏い ·冥い ·闇い】

(adj-i) dark; gloomy
あたりがもう暗くなっていることに気がついた。
I observed that it had already got dark.
dark (in colour); dull
depressed; dispirited
sorrowful; bitter (as in a dark past)
unclear; unfamiliar; unknown

かこ(kako) 【過去】

(n-adv, n) the past; bygone days; the previous
私はいつまでも過去にこだわらないようにと心がけている。
I try not to dwell on the past.
a past (i.e. a personal history one would prefer remained secret); one's past
(ling) past (tense); preterit; preterite
(Buddh) previous life