Definitions

1. noun

an instrument or device for deepening something, especially a part of a tooth

“The dentist used a drill as a deepener to prepare the tooth for the filling.”

2. noun

a person or thing that deepens something, such as a feeling or an understanding

“Her conversations with the therapist were a deepener for her emotional intelligence.”

3. verb

to make something deeper

“The excavation deepened the trench, revealing a hidden cave.”