dugout

noun

1.
either of two low shelters on either side of a baseball diamond where the players and coaches sit during the game
2.
a canoe made by hollowing out and shaping a large log
3.
a fortification of earth; mostly or entirely below ground
4.
a shelter for humans or domesticated animals and livestock based on a hole or depression dug into the ground; can be fully recessed into the earth, with a flat roof covered by ground, semi-recessed, with a constructed wood or sod roof standing out, or dug into a hillside.