- 1[intransitive, transitive] deepen (something) (into something) if an emotion or a feeling deepens, or if something deepens it, it becomes stronger Their friendship soon deepened into love.
- 2[intransitive, transitive] deepen (something) to become worse; to make something worse Warships were sent in as the crisis deepened. a deepening economic recession
- 3[intransitive, transitive] to become deeper; to make something deeper The water deepened gradually. His frown deepened. deepen something There were plans to deepen a stretch of the river.
- 4[transitive] deepen something to improve your knowledge or understanding of something an opportunity for students to deepen their understanding of different cultures
- 5[intransitive, transitive] deepen (something) if color or light deepens or if something deepens it, it becomes darker deepening shadows
- 6[intransitive, transitive] deepen (something) (to something) if a sound or voice deepens or if you deepen it, it becomes lower or you make it lower His voice deepened to a growl.
- 7[intransitive] if your breathing deepens, you breathe more air into your lungs than before Word Familydeep adjective adverbdeeply adverbdeepen verbdepth noun
NAmE//ˈdipən//Verb Forms present simple I / you / we / they deepen
he / she / it deepens
past simple deepened
-ing form deepening