The size labeled small among standard options

• An item that is size small
• A person who wears size small
• A smaller part, especially the small of the back

Archaic: to make smaller

• Archaic: to become small; to dwindle

Underwear, especially small garments

• Small goods or minor items
• The preliminary examination for a degree, chiefly British
• Ellipsis of small advertisements, chiefly British

Third-person singular simple present of small