A person whose job is to turn animal skins into leather.
Tanners are skilled workers who make things that are very useful.
Examples:
The tanner makes leather from animal skins.
My uncle is a tanner.
The tanner's shop smells like leather.
The tanner's hands are always dirty.
The tanner can turn a cow's skin into a soft leather jacket.
The tanner's work is hard, but important.