"Uparname" (उपरनामे) is a Jain ritual or practice that involves the renunciation or giving up of something by a layperson (Shravak or Shravika) for a specific period, usually as a form of self-discipline, penance, or spiritual progress. It is a vow to abstain from a particular activity, food, or possession for a certain number of days.

"Lagass" generally refers to a specific type of fast or a vow of abstaining from certain foods, particularly grains or cereals.

So, "Lagass ka uparname" means taking a vow (uparname) to observe Lagass, i.e., to abstain from consuming grains (and sometimes pulses or other foods, depending on the tradition) for a specific period. This is usually done with the intention of purifying oneself, accumulating punya (merit), and progressing on the spiritual path, in line with Jain principles of self-restraint (samyam) and non-attachment (aparigraha).

If you wish to perform Lagass ka uparname, it is recommended to consult with a Jain monk or a knowledgeable member of your Jain community to understand the correct procedure and the spiritual significance according to your sect (Shwetambar or Digambar) and local traditions.