adjective [ only before noun ]
1.
in which the front part of one vehicle hits the front part of another vehicle :
a head-on crash / collision
2.
in which people express strong views and deal with sth in a direct way :
There was a head-on confrontation between management and unions.
► ˌhead-ˈon adverb :
The cars crashed head-on .
We hit the tree head-on.
to tackle a problem head-on (= without trying to avoid it)