atós-i-m/t/ts comes from the Medieval Greek atós mu ‘on my own’ (Papanis & Papanis 2004˙ Ralli 2017).
E.g. tútiɲ íni θcá m ðʎá. atí-m θa d-gánu. tútini íne ðicá mu ðuʎá. atí-mu θa(n)-tin-káno. ‘This job is mine. I will do it myself’.