(transport) A collision where the front ends of two vehicles (such as ships, trains, cars, planes, etc.) hit each other, as opposed to a side-collision or rear-end collision.

plural of head-on collision

plural of head boy

Alternative spelling of headrush

(idiomatic) To remain calm, reasonable, level-headed, especially in a situation likely to cause distress.

(aviation) A pitot tube.

Alternative form of head-scratcher.

Assumed or borne, as a responsibility or something blameworthy. / Assigned by government authorities as a bounty or penalty.

(transitive, idiomatic) To harp on; to remind continuously (especially of a misstep or defeat).

Used other than figuratively or idiomatically: see cylinder, head.