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

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ad. Sideways.

ad. sideways

ad. A heavy swinging blow from the side, which disables an adversary.

Toward one side; in an inclining position: as, to hold the head sidewise.

Laterally; on one side: as, the refraction of light sidewise.

Directed or tending to one side; lateral in course or bearing; sideling: as, a sidewise glance; to make a sidewise leap.

ad. with one side forward or to the front

ad. toward one side

ad. from the side; obliquely

"The man, half-slipping sidewise from the saddle, so as to fall clear if the mare toppled backward, threw his weight to the front and alongside her neck."

sideways    give-away    sideward    roundhouse    side-to-side    backward    takinga    lb-ft    wantonly    well-practiced