Definition of (ごう)

noun
1.
moat, fosse, trench, ditch(濠 is usu. filled with water, 壕 is usu. dry)
2.
underground air-raid shelter, dugout(only relevant for 壕)
Other readings:
【ごう】
Related Kanji
trench, dugout, air raid shelter
moat, ditch, canal, Australia