on side

/AA1 N S AY0 D/
noun
  1. 1

    The leg side.

Antonyms

adjective
  1. 1

    Not in an offside position; In the part of the playing area where one can legally play the ball, puck, etc.

    โ€œThe goal was allowed because the attacker was onside.โ€

  2. 2

    On the side of a vehicle from which the driver, paddler, etc. propels it.

  3. 3

    Favourably located, from the point of view of the player taking a finesse.

  4. 4

    In agreement or support; on board.

Source: https://en.wiktionary.org/wiki/on%20side, https://en.wiktionary.org/wiki/onside