traveling, proceeding, or headed east: an eastbound train.

1875–80, Americanism; east + -bound2

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eastbound (ˈiːstˌbaʊnd)
going or leading towards the east

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Example sentences
Ferries are packed in summer, so arrive early and stay patient, especially on
  the eastbound ride back to reality.
Two eastbound lanes are shown beginning on the left of the figure and then
  reducing to one lane on the right.
One lane of eastbound traffic and two lanes of westbound traffic will be
  maintained during this stage.
New site, consolidating two smaller eastbound rest areas formerly located
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