immersing oneself in, being absorbed in, devoting oneself to, giving oneself up entirely to
陥没【かんぼつ】
cave-in, collapse, sinking, depression (e.g. of the skull), subsidence
沈没【ちんぼつ】
sinking, foundering, going down, submersion, getting dead drunk, having too much fun (esp. in a red-light district, etc.) and missing work or neglecting one's duties, staying in one place for a long time
死没【しぼつ】
death
没落【ぼつらく】
ruin, fall, collapse, downfall, bankruptcy
水没【すいぼつ】
submerge
没年【ぼつねん】
year of a person's death, one's age at death
埋没【まいぼつ】
being buried, remaining unknown, being forgotten, being absorbed (e.g. in research), being immersed
出没【しゅつぼつ】
making frequent appearances, appearing often, appearing and disappearing