Agati means "not going" or "not moving" (from a root like gati, with a negative a-). In Jain usage it is often related to renunciation or turning away from worldly movement toward liberation. The exact nuance can vary a bit between Digambar and Shwetambar traditions, but the core idea is about ceasing the ordinary movement of life that ties one to samsara and moving toward spiritual aim.

If you have a specific verse or stotra where agati appears, share it and I can explain the exact meaning in that context according to the respective tradition.