Definitions:

1. inclining or directed to one side adjective
   • moved downward in a sidelong way Bram Stoker
2. on the side adverb
   • the plow lay sidelong on the ground
3. to, toward or at one side adverb
   • darting eyes looking sidelong out of a wizened face
4. with the side toward someone or something adverb
   • seated sidelong to the window Nathaniel Hawthorne

Synonyms:

• askance
• lateral
• obliquely