from the horse's mouth vs head-on

from the horse's mouth

head-on

noun

A collision from the front.

adj

Of a collision, from the front or in the direction of motion.
Direct, abrupt, blunt or unequivocal; not prevaricating.

adv

With the front of a vehicle.
With direct confrontation.

How often have the words from the horse's mouth and head-on occurred in a corpus of books? (source: Google Ngram Viewer )