chasm
chasm
The word deepen means to cause to become more deep. For example, if you have a hole that is five feet deep and you dig it out so that it becomes six feet deep, you have deepened the hole.
Well, cavern...
The Greek word that chasm came from is the word abyss. An abyss is a very deep, deep hole that is so deep it never seems to have a bottom.
A four letter word for not shallow is deep.
hole
ace
shallowShallow
coma
Hole Cave
dry hole