Etymology
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head-on (adv.)

1840, from head (n.) + on.

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Definitions of head-on
1
head-on (adv.)
in direct opposition; directly;
we must meet the problem head-on
head-on (adv.)
with the front foremost;
the cars collided head-on
2
head-on (adj.)
characterized by direct opposition;
a head-on confrontation
head-on (adj.)
meeting front to front;
a head-on collision
Synonyms: frontal
From wordnet.princeton.edu