LATIN DICTIONARYLexicon Latīnum
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“flatten” in Latin

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

flatten v.
TRANS.,
To make flat, complanare: *tundendo extenuare (e.g., gold, silver, aurum, argentum): levigare, seldom levare (general term, for removing roughness, etc.).
To deject, Vid:
INTRANS., evanescere or fugere (to grow flat; of wine).

Quick answer

What is the Latin word for flatten?
The usual Latin words for “flatten” are complānō, levigō, levō; also ēvānēscō, fugiō, argentum. 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.