He smiled broadly, revealing his white teeth.
Meaning: He smiled widely, and you could see his white teeth.
Choice of Words: Broadly means in a wide or open way. Revealing means to make something known or visible. White is the color of snow or milk. Teeth are the hard, bony parts in the mouth used for biting and chewing. When put together, it means he smiled in a wide way, showing his white teeth.
Alternative Expressions
Related Expressions