osaṭa : [pp. of osarati] come into; re-entered; assembled.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Osaṭa [pp. of o + sṛ] having withdrawn to (acc.), gone to or into, undergone, visited M i.176, 469 (padasamācāro sangha -- majjhe o.); ii.2 (Rājagahaŋ vass˚āvāsaŋ o.); Miln 24 (sākacchā osaṭā bahū). See also avasaṭa.

Pali-English Dictionary, TW Rhys Davids, William Stede,