(literary) they

line / level / beam

(military) operation / strategy

defense, self-defense / protection

defend

to stand, to place in an upright position / to release something physical but not solid or liquid / (Internet slang) to start (a thread)

熱い: (of an object or feeling) hot / 熱い: (of one's body temperature) hot, feverish / 熱い: ardent, enthusiastic, impassionate / 熱い: (of love between a couple) passionate / 暑い: (of weather) hot, baking

厚い: thick / 厚い, 篤い: hearty, sincere, warm / 篤い: (of sickness) serious

忠厚: a male given name

Ka-ending dialect form of あつい (atsui, “hot”)