Question

A horse! a horse! My kingdom for a horse! is what

simile
metaphor
hyperbole
personification
idiom

Answer 1

It is a Hyperbole

Step-by-step explanation:

as a Hyperbole is "exaggerated statements or claims not meant to be taken literally."

also "This phrase is hyperbolic, because no horse can cause the loss of a kingdom."

Answer 2

I would say Hyperbole