sole of a shoe

sediment or residue remaining at the bottom of a container when oil is almost used up

The truth about someone's past, private affairs, or family history; one's background, secrets, or ancestry

(dialect) inflammation of the inner ear or eardrum, commonly referring to a condition where pus drains from the ear

(especially of an actor or performer) possessing solid skills or being highly capable; having a strong foundation

To lay a foundation; to provide a basis for future development or learning