It means there is very little hope of making a recovery/surviving as a medical term.
estan grave. its very very bad. es - tan - gra-vey.
But very serious.
sad music (music that is grave) Mournful tunes Of Minor Melodies
The phrase "one foot in the grave" is a idiom that means someone is very close to death or in a very weak or vulnerable state, usually due to age or illness.
Grave, solemn, earnest, grim, humorless
A grave threat is a threat made very seriously.
It is an adverb. It can mean "actually" or colloquially it can mean very (e.g. really mad).
Very
very ill. so ill that it might seem like your going to the grave with you illness
To take apart or dismantle something like when you dissect something in biology class,or in anither sense to look at something very closely
Nano = Very small.
a continent you mean?