bottom first

• baseSupporting bottom structure
• lowestLeast in position
• underneathIn position below
• foundationUnderlying support structure
• floorIndoor walking surface

rear · buttocks · last · underside · depth · end · seat · root · basement · nadir · tail · rump · ground · starting · origin · priority · beneath · below

• fetal positionsvertex, breech, cephalic, transverse, head down