Third-person singular simple present indicative form of double-head

Having two heads. / (numismatics) Of a coin, having a head on both sides, especially when counterfeited by being constructed from two separate coins.

simple past tense and past participle of double-head

(rail transport) The use of two locomotives at the front, or head, of a train.

present participle of double-head

(rail transport) To haul a train with two locomotives at the head end.