This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. Sports In such a position as to be able to play or receive a ball or puck legally.

adj. Not in an offside position.

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

adj. Not offside; being within the prescribed area of play.

Middle English forms of aside.

n. In cricket, that part of the field of play to the left of the wicket-keeper and to the left of an imaginary line drawn between the wickets and extended in either direction to the boundary.

adj. not offside; being within the prescribed area of play

"After going up, 13-7, on Murray's 26-yard touchdown pass to Rantavious Wooten, Georgia called an onside kick and appeared to pull it off perfectly, the ball bouncing high over the front line of blockers and right into the hands of Bacarri Rambo."

on side   

toset    retooling    straight-legged    thetide    well-delivered