Definition of back East in English:

back East

adverb

North American
  • In or to the eastern part of the United States or Canada (especially the coastal regions) from the west.

noun

North American
  • The eastern part of the United States or Canada (especially the coastal regions), as regarded by inhabitants of the west.

Origin

Mid 19th century; earliest use found in Prairie Farmer. Apparently partly from back + east, and partly from back + east.

Pronunciation

back East

/ˌbak ˈiːst/