Definition of inside-in in US English:

inside-in

adjective

Tennis
  • Designating a forehand shot played down the line on a ball struck to the player's backhand (or vice versa), which is set up by the player running across the trajectory of the ball.

Origin

1990s. From inside + in, after inside-out.

Pronunciation

inside-in

/ˌɪnsʌɪdˈɪn/