sugar daddy (a middle-aged man who pays a more younger girl in exchange of her companion)

(informal) activity in pursuit of love

(informal) to do activities in pursuit of love

(slang, pun) Used as a replacement for the term 生活(せいかつ) (seikatsu, “life”) in sexual contexts.

taking care of one's affairs before death

(geology) active fault

歳々年々: year in, year out

医学: medicine, medical science, the study of medicine

下学: elementary learning / 下顎: lower jaw / 化学: chemistry / 科学: science / 家学: hereditary learning / 歌学: poetry

下顎: lower jaw / 寡額: minimum amount set for a fine / 価額: value, amount