“Appāṇaṁ vosirāmi” (often pronounced “Appanam bosi rami / vosirami”) is a line from the Karemi Bhante / Samayik sutra.

Full line in Prakrit: > Tassa bhante! paḍikkamāmi, nindāmi, garihāmi, appāṇaṁ vosirāmi.

Simple meaning:

• Tassa bhante paḍikkamāmi – O Revered One! For those faults I repent.
• Nindāmi – I condemn those faults.
• Garihāmi – I am ashamed of those faults.
• Appāṇaṁ vosirāmi – I give up those faults of my own self and firmly decide not to repeat them.

Very simple arth of “Appāṇaṁ vosirāmi”: > “I renounce my own wrong actions and bad habits, and I resolve to leave them forever.”

Both Śvetāmbara and Digambara traditions accept the same basic sense here: it is a deep inner confession and vow to drop past sins and purify oneself.