thorough

bottom of the ocean ②undersea

thoroughness ②thorough enforcement

depths of the earth

submarine volcano

root

ship's bottom

base (of a polygon) ②bottom (of the social scale) ③base (e.g. of support)

do-or-die resistance

bottom of a lake

sea or river bottom

base

fundus of the eye

underground lake

undersea tunnel

totally useless (fruitless) effort

seabed probe

reaching the bottom

palm heel

well bottom

bottom

bottom of one's heart

bottom of one's heart ②from the bottom of one's heart

very bottom

hidden reserves of strength

bottomless

valley floor

depths ②bottom (of one's heart)

depths of Hell ②abyss

thick soles

raising (the standard)

bottomless (bucket, etc.) ②unbounded (good nature, optimism, etc.) ③imprudent ④extremely heavy drinker

riverbed

sole (of a shoe) ②sole (fish)

false bottom ②exaggeration

bottom of a box

dark of the night

bottom price

double bottom (ship, trunk, etc.)

latent disposition