Definition of eastern grip in English:

eastern grip

noun

Tennis
  • A manner of gripping the racket in which the bottom knuckle of the index finger and the heel of the hand are in contact with the top of the handle, typically used for flat forehand shots.

    ‘for the overhead slice serve, take hold of your racket handle in the eastern grip’

Origin

1920s: so named because it was originally considered characteristic of tennis players from the East Coast of the US.