/huy"jak'/ , v.t.
1. to steal (cargo) from a truck or other vehicle after forcing it to stop: to hijack a load of whiskey.
2. to rob (a vehicle) after forcing it to stop: They hijacked the truck before it entered the city.
3. to seize (a vehicle) by force or threat of force.
4. to skyjack.
v.i.
5. to engage in such stealing or seizing.
n.
6. an act or instance or hijacking.
Also, highjack .
[ 1920-25, Amer.; back formation from HIJACKER ]