Meanings

double bottom (ship, trunk, etc.)

inconsistent

shortage

flat-bottomed boat

flat bottom

breechblock (of a gun)

depths

ship's bottom

riverbed

thick soles

reaching the bottom

raising (the standard)

bottom of the water

stable (market) after having bottomed out

base (of a polygon)

undercurrent

base angle

the bottom of one's heart

bottom of a lake

undersea cable