adj. or adv. phr. 1. With the head or front pointing at; with the front facing; front end to front end. Our car skidded into a head-on crash with the truck. In the fog the boat ran head-on into a log. There is a head-on view of the parade from our house.
Compare: FACE-TO-FACE.
Antonym: REAR-END. 2. In a way that is exactly opposite; against or opposed to in argument. If you think a rule should be changed, a head-on attack against it is best. Tom did not want to argue head-on what the teacher said, so he said nothing.