Sideways (adverb)

1. In a direction that is parallel to the side of something, rather than along its length or width.
2. In an oblique or diagonal direction.

Origin:

From the phrase "by the side", which refers to a direction that is parallel to the side of something, rather than along its length or width. the term was first used in the late 18th century.

Examples:

1. She looked at him sideways, trying to read his expression.
2. He turned his head sideways to avoid the bright sun.
3. The car spun sideways and hit the guardrail.
4. The picture hung sideways on the wall.
5. He was walking sideways, trying to avoid the mud.