LATIN DICTIONARYLexicon Latīnum
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“deepen” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

deepen
deprimere (to fix deeper in the ground; opposed to tollere, allevare; e.g., a building, aedem): *majorem in altitudinem deprimere (after mirandam in altitudinem depressus, etc.): altius imprimere (e.g., a furrow, sulcum): excavare (to hollow out; e.g., the shores): depressius fodere (Sen., Cons., ad Helv., 9; e.g., specus).
To make darker; to deepen the darkness, densare tenebras (after Verg. obtenta densantur nocte tenebrae): to deepen a color, colori austeritatem dare (Plin.): colorem adstringere or astringere (opposed to excitare, to make it brighter, Plin.): to deepen colors that are too bright, nimis floridis coloribus austeritatem dare (Plin., 35, 10).
Increase (e.g., sorrow, etc.), augere (dolorem, molestiam, etc.).

Quick answer

What is the Latin word for deepen?
The usual Latin words for “deepen” are dēprimō, excavō, augeō; also allevō, aedis, sulcus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.