Probably a back-formation from Erzyaчачомс(čačoms,“to be born”).

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чачо• (čačo)

1. face

   Synonym:чама(čama)

2. person

   Synonym:ломань(lomań)

3. identity

   чачонь кемекстамо конёв ―čačoń kemekstamo końov ―an identification document

4. facial expression,look,mien,appearance
5. shape,form
6. figure

   Synonym:фигура(figura)

7. color

   Synonym:тюс(ťus)

This entry needs aninflection-table template.

• B. A. Serebrennikov, R. N. Buzakova, M. V. Mosin (1993) “чачо”, inЭрзянь-рузонь валкс [Erzya-Russian dictionary], Moscow:Русский язык,→ISBN
• Entry #95 inUralonet, online Uralic etymological database of theHungarian Research Centre for Linguistics.

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