to sink; to go to the bottom / (of the sun) to set / to be immersed / to feel downcast, dejected, depressed / to droop

academy (specialized school), vocational school

sense of alertness / caution

防止: prevention / 帽子: hat, cap / 暴死: a sudden death, as from a heart attack / 鋩子: the tip of a sword or dagger blade