No
Metaphor
"He was a lion in the fight" is a metaphor.
Firstly the whole image of sailing out on the tide is a metaphor for death. The bar is a metaphor for the boundary between this life and the next. The Pilot stands for God.
A metaphor
"Piece of cake" is both a metaphor and an idiomatic expression.
is the death of a hired man a metaphor?
Prisoners can starve to death even in modern times if nobody gives them food.
no
you die
They starve to death.
Yes
Metaphor
The metaphor sentence in Rikki Tikki Tavi is "I am Death!" This compares the snake to Death.
They will if they're not fed properly, or given poor quality feed that they will simply starve to death on.
It takes about a month of not eating to starve to death.
It depends on where you're living.
They starve to death