A person who puts shingles on a roof.
Shinglers are important for making sure roofs don't leak.
Examples:
The shingler is putting new shingles on the roof.
I want to be a shingler when I grow up.
The shingler is working hard in the sun.
The shingler must be careful not to fall off the roof!
The best shingler in town can shingle a whole roof in one day.
The shingler's job is to make sure the roof is safe from rain.