(informal) Alternative form of あり (ari, “ant”)

line / level / beam

railway

教頭: head teacher / 共闘: joint struggle / 鏡筒: lens tube / 郷党: one's hometown or people from it / 驚倒: sensationalism / 凶党: gang

共闘: struggle together / 驚倒: be sensational

発動:

(intransitive) to collect; to gather; to assemble

horizon on water / a horizontal or level line (perpendicular to the force of gravity)

horizon on land

putting a machine into operation / putting into action