deepen

verb

deep·​en ˈdē-pən 

deepened; deepening ˈdē-pə-niŋ 

ˈdēp-niŋ

transitive verb

: to make deep or deeper

intransitive verb

: to become deeper or more profound

Synonyms of deepen

• intensify
• enhance
• heighten
• strengthen

Examples of deepen in a Sentence

They deepened the river so that larger boats could sail through.

Age had deepened the lines in his face.

The water deepens toward the center of the river.

Her powerful words deepened our commitment to the cause.

The vacation together deepened their relationship with each other.

The mystery was deepened by her silence.

This class will deepen your understanding of economics.

Living in the country's capital had deepened her knowledge of politics.

Recent Examples on the Web

In its examination of Haiti’s deepening crisis, the panel detailed how influential figures in Haitian society continue to support armed gangs. — Jacqueline Charles, Miami Herald, 9 Oct. 2026

What’s made this franchise so beloved has been its willingness to go on that journey with its young characters, maturing and deepening and changing without losing that initial childlike sense of hope and joy. — Angie Han, HollywoodReporter, 9 Oct. 2026

High West bourbon lays a warm, oaky foundation for a seasonal blend of crisp apple, aromatic cloves and cardamom, all deepened by the velvety sweetness of crème de cassis. — Angela Hansberger, AJC.com, 9 Oct. 2026

Fear of default then leads to even more capital flight, which increases fears of default and the interest rate, and the vicious circle deepens. — Jenni Reid, CNBC, 9 Oct. 2026

Word History

First Known Use

1600, in the meaning defined at transitive sense

Rhymes for deepen

• cheapen
• marzipan

Kids Definition

deepen

verb

deep·​en ˈdē-pən 

deepened; deepening ˈdēp-(ə-)niŋ 

: to make or become deep or deeper