A small person, thing, or amount of something is not large in physical size.

A small group or quantity consists of only a few people or things.

A small child is a very young child.

You use small to describe something that is not significant or great in degree.

Small businesses or companies employ a small number of people and do business with a small number of clients.

If someone speaks in a small voice, they speak in a quiet, high voice because they are frightened or ashamed.

If someone makes you look or feel small, they make you look or feel stupid or ashamed.

The small of your back is the bottom part of your back that curves in slightly.