Question

figure of speech It cost a billion dollars

Answer 1

metaphor is the answer....

Answer 2

A figure of speech is a word or phrase used instead of a long sentence.this can be metaphor or simile, alliteration or hyperbole.

They are more commonly used in poetry or speeches.

A Figure of speech for it cost a billion dollar is 'precious'.

It means that the thing which you hold is too costly and it IS really precious so that you should not lose it.