A footpath near a road.

A byway.

Moving or directed toward one side.

“He gave the ball a sideways kick.”

Positioned sideways (with a side to the front).

“There was a stack of papers in front of each seat at the table, but each stack was sideways.”

Neither moving upward nor moving downward.

“Once we get out of this sideways economy, our figures will more accurately reflect what we're truly capable of.”

With a side to the front.

“He builds houses sideways, with the front door on the side.”

Towards one side.

“A bishop moves only diagonally; a rook, only sideways, forward, and back.  He looked sideways at the new arrival, wondering who she was.”

Askance; sidelong.