Posadh (also called Poshadh) is a monsoon period in Jain monastic practice when monks and nuns stay in one fixed place and intensify meditation, study, and penance. It is a time to renew vows, reflect on conduct, and listen to sermons. In the Terapanth tradition, Posadh is observed with particular emphasis on discipline, orderly routine, and group discipline (samata). The community focuses on:

• Fixed residence during the period, with limited movement.
• Increased study of Jain scriptures and reflection on conduct (samyak ceremonials and pratyakhyan as appropriate).
• Extra emphasis on ahimsa (nonviolence), satya (truth), and aparigraha (non-attachment).
• Discourses, collective prayers, and mutual oversight to maintain discipline.

Important note about differences:

• Digambar and Shwetambar communities have variations in details of the rituals, timings, and exact rules during Posadh. Terapanth, being a distinct Jain sect, follows its own specific schedule and code of conduct within the broader framework of Jain monastic discipline.

If you want, I can explain the exact Terapanth timetable and practices during Posadh as described in their tradition, or provide a short, traditional Sanskrit/Prakrit verse (stotra) that is recited during Posadh along with its meaning.

You can read more on these aspects in the Terapanth-focused compilations of Jain practice.