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

During the next two years, Pahlavi expanded his operation and deepened his ties with Israel. —Azadeh Moaveni, New Yorker, 22 Mar. 2026

The market's losses deepened after oil prices erased an early dip and accelerated in the afternoon. —Arkansas Online, 21 Mar. 2026

Questions and anxiety deepened in some of San Diego’s TV stations Friday, a day after the federal government approved a deal that puts the region’s FOX, CBS and CW affiliates, plus KUSI, under the same ownership. —Teri Figueroa, San Diego Union-Tribune, 21 Mar. 2026

Connecting teams to the distinctive identities of their cities can strengthen fan engagement and deepen local relevance. —Rick Burton, Sportico.com, 21 Mar. 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