D defs.my
Entry 2 senses Webster, 1913

eastbound

· IPA /ˈistbaʊnd/
01 adj. moving toward the east; as, eastbound trains.
  1. 1.
    moving toward the east; as, eastbound trains.
  2. 2.
    designated for traffic moving toward the east; -- of lanes in roads or railroads, or other traffic lanes; as, the eastbound lanes of Interstate 80 are blocked by an overturned tractor-trailer; the train will leave on eastbound platform 5.
Syn. eastward.