ushi no toki mairi, a traditional Japanese practice where a person visits (参(まい)り (mairi)) a shrine at approximately 2 AM in the morning (丑(うし)の時(とき) (ushi no toki)) in order to nail a straw effigy of a person (藁人形(わらにんぎょう) (waraningyō)) to a tree and wish for that person's death

Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)

(linguistics) diachronic

(linguistics) synchronic

time for repayment for past misdeeds / time to give up

(organic chemistry) an organic compound

(inorganic chemistry) an inorganic compound

(chemistry) a sandwich compound

penny wise and pound foolish; you get what you pay for

(chemistry) acidic oxide